Technical White paper RAID Protection and Drive Failure Fast Recovery

Save this PDF as:
 WORD  PNG  TXT  JPG

Size: px
Start display at page:

Download "Technical White paper RAID Protection and Drive Failure Fast Recovery"

Transcription

1 Technical White paper RAID Protection and Drive Failure Fast Recovery RAID protection is a key part of all ETERNUS Storage Array products. Choices of the level chosen to meet customer application requirements involve evaluating a number of aspects of the application demands. The considerations of these aspects are addressed in this paper, including operation in degraded mode, time to recover to a protected state, and time to restore to the fully configured state. The introduction of the Fast Recovery feature changes some of the long held assumptions about the use of the different RAID level choices and provides recovery to a protected state in a small fraction of the time of other choices. Table of Contents 1 Introduction Definitions Failure / Protection Relationships RAID1 and RAID10 Failed Drive Operations RAID5 Failed Drive Operations RAID6 Failed Drive Operations Failed Drive Operations The Cost of Protection Recovery of Protection Copy-back Full Configuration Restore Considerations Conclusions Minimum and Nominal Rebuild Time Charts... 6 List of Figures Figure 1 - Minimum Rebuild Times with very low host traffic... 6 Figure 2 - Nominal Rebuild Times with host traffic... 6 List of Tables Table 1 - Valid RAID Group Combinations... 2 Table 2 - Normalized Relative Rebuild Rates... 3 Table 3 - Usability / Protection Relationships Introduction RAID has been the standard means of ensuring against loss of data with storage arrays for many years, with several organizational forms available within the ETERNUS Storage Array product family. There are three key aspects of protecting against data loss when drives fail; first, operations when the failure is recognized; second, recovery to a protected state; and third when the failed drive is replaced and how the array handles the replacement operation. The introduction of the Fast Recovery feature in the ETERNUS Storage Arrays has changed the environment of data protection and recovery. This paper provides some insight into the value of this feature as well as helping the reader understand the impact of different RAID protection mechanisms on the effective deployment of the storage array products. Page 1 of 7 This paper is not intended to be a tutorial on RAID technology, as the technology is well covered in many existing documents, both within Fujitsu and in publicly available papers. 2 Definitions In the context of this paper, there are several definitions that the reader needs to understand to get the full meaning of the information provided. Fully Protected the state of a RAID Group when all of the protection capability offered by that particular RAID Group organization is in force. Degraded Mode the state of a RAID Group when the data is still accessible by the applications, but there may be no protection or a lower level of protection than the RAID Group offers when Fully Protected. Rebuild Mode the state of a RAID Group when the data is accessible, but there has been a failure and operations are underway to restore the RAID Group to a Fully Protected state.

2 Copy-back Mode the state of a RAID Group when the protection data is being restored to a replacement drive, while the RAID Group is in a Fully Protected state Copy-back-less Mode a mode of operation where a replacement drive does not assume the role of the drive it is replacing, but leaves the protection data in the rebuilt target location(s). Global Hot Spare (GHS) one or more drives within an array that can be used in any of several RAID Groups to replace a failed drive through the rebuild process appropriate for that RAID organization. Dedicated Hot Spare a drive that is a part of a RAID Group but that is not holding active data, but rather is available to replace a failed drive within just that group. a special form of a RAID6 Group that includes a Dedicated Hot Spare-like drive with all drives active within the normal operation of the group. The Hot Spare space is distributed across all of the drives in the group. There are specific valid member disk combinations, where xd represents a number of Data drives, 2P designates two Parity drives, and 1HS indicates one Dedicated Hot Spare drive. Organization (Ordered by Total Drives per RAID Group) User Drives per RAID Group Total Drives per RAID Group (3D+2P)x2+1HS 6 11 (6D+2P)x2+1HS (9D+2P)x2+1HS (12D+2P)x2+1HS (5D+2P)x4+1HS (13D+2P)x2+1HS (3D+2P)x6+1HS Table 1 - Valid RAID Group Combinations Usability Factor the portion of the total space in the drives of a group that can be used to hold user data (see Table 3); the higher the usability factor the less the cost in number of drives for a given amount of user storage. Likewise, the lower the usability factor the greater the cost in number of drives for a given amount of user storage. 3 Failure / Protection Relationships When disk drives fail within a RAID protected set, a change in activity takes place. With the data space that was held on the failed drive no longer available, accesses require special processing; depending upon the organization of the RAID Group. Failure Probability indicates the probability that a device will fail, in this case that there will be a failure in a disk drive. There are a number of different failures that can occur within a disk drive that are important to consider in choosing a RAID Group organization. Degraded Operation Time indicates the period of time that the RAID Group must reconstruct portions of the data that were held on the failing drive. Recover Protection Time indicates the period of time that the RAID Group has less than the expected level of fault protection. This is the time that a Hot Spare may be used to rebuild the content of the failed drive. During this time, host accesses will experience greater than normal response times. Restore Protection Time indicates the period of time that will be required to fully restore the RAID Group to the planned configuration. This includes the time required to obtain the replacement drive, get it installed in the array, and restore it into the planned configuration role. 3.1 RAID1 and RAID10 Failed Drive Operations In the case of RAID1 or RAID10, instead of balancing the Read operations across the two mirrored drives, all of the reads must be serviced by the remaining drive of the pair. Instead of writes being directed to both drives of the pair, only one write can be supported. Although failure of another drive within a RAID10 group is protected, if the failing drive is mated with an already failed drive, the second failure will result in data loss. If there is a suitable Hot Spare drive, either dedicated or global, then rebuilding can begin to restore protection to the group right away. The operation of rebuilding a RAID1 or RAID10 member involves copying the data from the surviving mate of the pair over to the replacement drive (either the Hot Spare or new replacement drive). The maximum rate of the rebuild is determined by the Write rate of the single drive in the copy operation. If the group is configured as a Copy-back Mode group, when the failed drive is replaced, a copy back operation will be initiated. Again this involves copying the content of the used Hot Spare drive to the new drive, and is limited to the maximum Write rate of the single drive in the copy operation. Page 2 of 7

3 3.2 RAID5 Failed Drive Operations In the case of RAID5, Read accesses require recovery of the data from the surviving drives within the RAID Group. Consider a RAID5(4D+1P) Group where four drives must be read to reconstruct the data for the failed drive access. Write operations involve reading from all of the surviving drives and may require writing back to one or two, depending upon where the data is located within the stripe. If there is a suitable Hot Spare drive, either dedicated or global, then rebuilding can begin to restore protection to the group right away. The rebuilding of a RAID5 group involves reading from all of the surviving drives and writing to the replacement drive. If another drive fails before the rebuilding process is completed, the failure will result in data loss. If the RAID5 group is configured in Copy-back Mode, when the failed drive is replaced, a copy back operation will be initiated. This involves copying the content of the used Hot Spare drive to the new drive, and is limited to the maximum Write rate of the single drive in the copy operation. 3.3 RAID6 Failed Drive Operations As in the case of RAID5, Read accesses in RAID6 require recovery of the data from the surviving drives within the RAID Group. In the case of a RAID6(4D+2P) Group, five drives must be read to reconstruct the data for the failed drive access. Likewise, Write operations involve reading all the surviving drives and writing two or three drives, depending upon where the data is located within the stripe. If there is a suitable Hot Spare drive, either dedicated or global, then rebuilding can begin to restore the full protection to the group right away. The rebuilding in a RAID6 group involves reading from all of the surviving drives and writing to the replacement drive. If another drive fails while the rebuilding process is active, the rebuilding can still complete without data loss, but the additional failed drive will need to be treated as well. The maximum rate of the rebuild is limited by the Write rate of the single drive. If the RAID6 group is configured in Copy-back Mode and a Hot Spare drive was used for the initial recovery, when the failed drive is replaced, a copy back operation will be initiated. This involves copying the content of the used Hot Spare drive to the new drive and is limited to the maximum Write rate of the single drive in the copy operation. With large NL-SAS drives, both rebuild and copy-back can take many hours, and with host traffic active, the very large drives can easily take more than a day to complete the rebuild or copy-back. With the protection present against a second drive failure afforded by RAID6, and with a maintenance contract to provide a replacement drive within a day for the failed drive, it has been recommended to not use Hot Spare drives for these RAID Groups. This is because the failed drive can usually be replaced before the first rebuild completes, but the rebuild must complete before the copy-back can begin, and therefore the system will incur a very long time of reduced capability while all the rebuilding and copyback is active. 3.4 Failed Drive Operations The introduces a new form of RAID6 Group, which includes an extra drive in support of two or more RAID6 groups. The equivalent space of one drive is provided through some reserved space on all of the drives in the set. Data spans all of the drives, along with dual parity protection over subgroups within the set using a rotating assignment scheme. When a drive in a group fails, rebuild begins immediately to the reserved space in all of the surviving drives. The rebuild operation proceeds more rapidly than in the other RAID organizations because the rebuild rate is not limited by the Write rate of a single drive. Table 2 shows the relative rebuild rates with both the standard RAID6 organization and most of the organizations. The key reason that the rebuild rates are much higher is that all of the surviving drives in the RAID Group provide space for the recovered data, eliminating the bottleneck of the Write rate of a single drive. This results in much shorter times that the group is exposed to a lesser degree of protection than planned in the configuration. The relative rebuild rates are normalized to the rate required by the RAID6(3D+2P) rate, considered in MB/s. This rate is determined by the Write rate on the target drive(s) for the rebuild. The time taken to rebuild is dependent upon the type of drive, the size of the drive and the amount of traffic in the system when the rebuild is running. RAID Organization (Ordered by Rebuild Rate) Rate with No Host Traffic Rate with Host Traffic RAID6(3D+2P) (3D+2P)x2+1HS (6D+2P)x2+1HS (9D+2P)x2+1HS (13D+2P)x2+1HS (3D+2P)x6+1HS Table 2 - Normalized Relative Rebuild Rates Certainly the rebuild rate is reduced when there is host traffic, as it is normally performed at low priority, giving preference to service of the user demands. Still it is clear that the higher rebuild rates for the organizations will significantly reduce the time that the array is exposed to loss at a level below the planned protection level. Page 3 of 7

4 4 The Cost of Protection Protecting against data loss does not come for free there is a cost for various levels of protection offered by the different RAID organizations. One way to look at the cost of protection is to consider what portion of the total space offered by the drives is available for user data. This can be viewed from a high level as the ratio of user drives to total drives. This needs to be weighed against the cost of lost data when a drive fails. Table 3 shows the levels of usability for approximately the same number of user drives and the associated protection level afforded by the different RAID organizations. Protect Level 0 indicates that there is data loss when any drive fails the data is not protected at all. Protect Level 1 indicates that one drive in a group can fail and the data is protected against loss, but a second drive failure will cause loss. Protect Level 2 indicates that any two drives in a group can fail and the data is protected against loss. RAID Organization (Ordered by Usability Factor) # RAID Groups User Drives Total Drives Usability Factor Protect Level RAID0(4D) (13D+2P)x2+HS (12D+2P)x2+HS (9D+2P)x2+HS (3D+2P)x6+HS RAID5(4D+1P)+GHS (6D+2P)x2+HS (5D+2P)x4+HS RAID6(4D+2P)+GHS (3D+2P)x2+HS RAID10(4+4)+GHS * Table 3 - Usability / Protection Relationships (1* indicates that in a RAID10 group there may be protection against another drive failure, provided it is not the mate of the first failed drive.) Note that Global Hot Spares are commonly used with some of the RAID organizations to reduce the number of drives and improve the Usability Factor. When the first drive failure in any group which is protected with a Global Hot Spare is encountered, the rebuild operation can begin right away. Some other group can encounter a failure, but without a spare to use, the rebuild will be delayed, exposing the group to data loss if another drive fails before the Hot Spare has been replaced. 5 Recovery of Protection A key aspect of any protection mechanism is the time of exposure to additional failures and the time required to recover a degree of protection closer to that planned in the configuration. It should be clear to the reader that until the failed drive is replaced, the protection level is not at that planned for the configuration. Recovery of the primary level of protection should be completed as soon as possible to ensure against data loss on any subsequent failures. The amount of time to complete the rebuild after a drive fault varies quite widely depending upon several factors. These include: RAID Organization most RAID organizations (RAID1, RAID10, RAID5, and RAID6) require rebuilding to a single replacement or Hot Spare drive, which limits the rebuild rate to the Write rate of a single drive. is able to use all of the surviving drives in the group during the rebuild process, therefore rebuilding at a much faster rate, reducing the exposure time. Drive Size and Speed the size and speed of the failed drive determine the rate of rebuild and the time it takes to complete the rebuild, with larger slower drives rebuilding can take a long time. Host Traffic the level of host traffic on the system also impacts the rebuild rate, as the rebuild is normally conducted at a lower priority than supporting the host demands, so with heavy host traffic, the exposure time is extended as well. The fastest rebuild rate, and therefore the minimum exposure time is when there is very little host traffic. In this case the RAID organization and drive type determine the exposure time. 5.1 Copy-back Full Configuration Restore Considerations It is important to recognize that it is necessary to replace any failed drive in a timely manner, and is no exception. Fast Recovery provides full protection for additional failures, but when the failed drive is replaced, it must be integrated into the group to complete the restore operation. This operation requires rebuilding the content of the single drive that is being reintroduced into the group. Unfortunately the rate for this operation is limited by the Write data rate of the single drive being reintroduced. This time is very much the same as the rebuild time for the RAID5 group shown on the charts taking much longer when there is host traffic than when there is little host traffic. Fortunately this is an operation that can be deferred until a portion of the day when the host traffic is light, and the rebuild rate will be the fastest. One of the really good aspects provided by is that the group is fully protected while the re-introduction process is underway, so any failure encountered can be recovered without data loss. Page 4 of 7

5 6 Conclusions This paper has shown that the feature reduces the recovery time for the first disk failure to only one tenth of the time that other RAID organizations require. This reduces the possibility of data loss from a second disk failure. By reducing the recovery time, normal host response time performance will return much more quickly than with conventional recovery procedures. In addition, provides full protection during the drive replacement process, further ensuring against data loss. It is noted however, that when there is heavy host traffic, the recovery time will take longer, but with the recovery time with traffic is still much less than with the other RAID organizations. As is always the case, recovery time is directly a function of the size and speed of the drives making up the RAID Group. Information has been provided for the reader to use in choosing an effective balance of recovery time and cost of storage for the specific demands of the application environment. It is quite clear that use of with larger NL-SAS drives makes the recovery time much more in line with much higher speed drives in the smaller sizes. This ensures that the data is protected as much of the time as possible when drive failures are encountered. Refer to the ETERNUS DX S3 Performance Guide (Advanced) P3AM- 7932, ETERNUS DX100 S3/DX200 S3 Product Notes P3AM-7682, and ETERNUS DX500 S3/DX600 S3 Product Notes P3AM-7762 for further information on details and limitations. Page 5 of 7

6 7 Minimum and Nominal Rebuild Time Charts Figure 1 - Minimum Rebuild Times with very low host traffic Figure 2 - Nominal Rebuild Times with host traffic Notice that with host activity, which represents the more normal situation, the rebuild times are approximately double what the best times can be when there is no host activity. The key benefit to realize with the organization is the rebuild times are only ~10% of what they are for the standard forms of RAID organization. This reduces the exposure time to additional failures to a much shorter time and provides protection for second failures long before a replacement drive can be installed, even when one is available on site. Page 6 of 7

7 About Fujitsu America Fujitsu America, Inc., is a leading ICT solutions provider for organizations in the U.S., Canada and the Caribbean. Fujitsu enables clients to meet their business objectives through integrated offerings and solutions, including consulting, systems integration, managed services, outsourcing and cloud services for infrastructure, platforms and applications; data center and field services; and server, storage, software and mobile/tablet technologies. For more information, please visit: and FUJITSU AMERICA, INC. Address: 1250 East Arques Avenue Sunnyvale, CA , U.S.A. Telephone: or Website: Contact Form: Have a question? us at: Fujitsu, the Fujitsu logo and ETERNUS are trademarks or registered trademarks of Fujitsu Limited in the United States and other countries. All other trademarks referenced herein are the property of their respective owners. The statements provided herein are for informational purposes only and may be amended or altered by Fujitsu America, Inc. without notice or liability. Product description data represents Fujitsu design objectives and is provided for comparative purposes; actual results may vary based on a variety of factors. Specifications are subject to change without notice. Copyright 2015 Fujitsu America, Inc. All rights reserved. FPC / Page 7 of 7

RAID Basics Training Guide

RAID Basics Training Guide RAID Basics Training Guide Discover a Higher Level of Performance RAID matters. Rely on Intel RAID. Table of Contents 1. What is RAID? 2. RAID Levels RAID 0 RAID 1 RAID 5 RAID 6 RAID 10 RAID 0+1 RAID 1E

More information

White paper 200 Camera Surveillance Video Vault Solution Powered by Fujitsu

White paper 200 Camera Surveillance Video Vault Solution Powered by Fujitsu White paper 200 Camera Surveillance Video Vault Solution Powered by Fujitsu SoleraTec Surveillance Video Vault provides exceptional video surveillance data capture, management, and storage in a complete

More information

RAID Level Descriptions. RAID 0 (Striping)

RAID Level Descriptions. RAID 0 (Striping) RAID Level Descriptions RAID 0 (Striping) Offers low cost and maximum performance, but offers no fault tolerance; a single disk failure results in TOTAL data loss. Businesses use RAID 0 mainly for tasks

More information

shaping tomorrow with you Reliable Innovation, Easy Cooperation, Real Value

shaping tomorrow with you Reliable Innovation, Easy Cooperation, Real Value shaping tomorrow with you Reliable Innovation, Easy Cooperation, Real Value Leadership you can leverage Exciting new opportunities with Fujitsu As a technology partner, we realize you have a choice about

More information

Storage node capacity in RAID0 is equal to the sum total capacity of all disks in the storage node.

Storage node capacity in RAID0 is equal to the sum total capacity of all disks in the storage node. RAID configurations defined 1/7 Storage Configuration: Disk RAID and Disk Management > RAID configurations defined Next RAID configurations defined The RAID configuration you choose depends upon how you

More information

FUJITSU Retail Solution Market Place Future-proofing Retail by architecting for tomorrow

FUJITSU Retail Solution Market Place Future-proofing Retail by architecting for tomorrow FUJITSU Retail Solution Market Place Future-proofing Retail by architecting for tomorrow Contents Creating a Retail Solution for today s needs and business requirements is relatively easy The Retail Journey

More information

Lenovo RAID Introduction Reference Information

Lenovo RAID Introduction Reference Information Lenovo RAID Introduction Reference Information Using a Redundant Array of Independent Disks (RAID) to store data remains one of the most common and cost-efficient methods to increase server's storage performance,

More information

Definition of RAID Levels

Definition of RAID Levels RAID The basic idea of RAID (Redundant Array of Independent Disks) is to combine multiple inexpensive disk drives into an array of disk drives to obtain performance, capacity and reliability that exceeds

More information

Best Practices RAID Implementations for Snap Servers and JBOD Expansion

Best Practices RAID Implementations for Snap Servers and JBOD Expansion STORAGE SOLUTIONS WHITE PAPER Best Practices RAID Implementations for Snap Servers and JBOD Expansion Contents Introduction...1 Planning for the End Result...1 Availability Considerations...1 Drive Reliability...2

More information

New Advanced RAID Level for Today's Larger Storage Capacities: Advanced Data Guarding

New Advanced RAID Level for Today's Larger Storage Capacities: Advanced Data Guarding White Paper October 2000 Prepared by Storage Products Group Compaq Computer Corporation Contents Introduction...2 What customers can expect from Compaq RAID ADG solution...3 RAID ADG Features and Benefits...3

More information

technology brief RAID Levels March 1997 Introduction Characteristics of RAID Levels

technology brief RAID Levels March 1997 Introduction Characteristics of RAID Levels technology brief RAID Levels March 1997 Introduction RAID is an acronym for Redundant Array of Independent Disks (originally Redundant Array of Inexpensive Disks) coined in a 1987 University of California

More information

Data Sheet Fujitsu ETERNUS CS High End V5.1 Data Protection Appliance

Data Sheet Fujitsu ETERNUS CS High End V5.1 Data Protection Appliance Data Sheet Fujitsu ETERNUS CS High End V5.1 Data Protection Appliance Radically simplifying data protection ETERNUS CS Data Protection Appliances The Fujitsu ETERNUS CS storage solutions, comprising ETERNUS

More information

Improving Lustre OST Performance with ClusterStor GridRAID. John Fragalla Principal Architect High Performance Computing

Improving Lustre OST Performance with ClusterStor GridRAID. John Fragalla Principal Architect High Performance Computing Improving Lustre OST Performance with ClusterStor GridRAID John Fragalla Principal Architect High Performance Computing Legacy RAID 6 No Longer Sufficient 2013 RAID 6 data protection challenges Long rebuild

More information

Fact Sheet Fujitsu Global Cloud Platform Infrastructure as a Service (Iaas)

Fact Sheet Fujitsu Global Cloud Platform Infrastructure as a Service (Iaas) Fact Sheet Fujitsu Global Cloud Platform Infrastructure as a Service (Iaas) Flexible and Secure IT that Stays Aligned with Your Business You have a business to run and a hugely complex infrastructure to

More information

RAID Technology Overview

RAID Technology Overview RAID Technology Overview HP Smart Array RAID Controllers HP Part Number: J6369-90050 Published: September 2007 Edition: 1 Copyright 2007 Hewlett-Packard Development Company L.P. Legal Notices Copyright

More information

RAID 6 with HP Advanced Data Guarding technology:

RAID 6 with HP Advanced Data Guarding technology: RAID 6 with HP Advanced Data Guarding technology: a cost-effective, fault-tolerant solution technology brief Abstract... 2 Introduction... 2 Functions and limitations of RAID schemes... 3 Fault tolerance

More information

RAID 0 (striping) RAID 1 (mirroring)

RAID 0 (striping) RAID 1 (mirroring) RAID 0 (striping) RAID 0 uses the read/write capabilities of two or more hard drives working together to maximize storage performance. Data in a RAID 0 volume is arranged into blocks that are spread across

More information

Assessing RAID ADG vs. RAID 5 vs. RAID 1+0

Assessing RAID ADG vs. RAID 5 vs. RAID 1+0 White Paper October 2001 Prepared by Industry Standard Storage Group Compaq Computer Corporation Contents Overview...3 Defining RAID levels...3 Evaluating RAID levels...3 Choosing a RAID level...4 Assessing

More information

an analysis of RAID 5DP

an analysis of RAID 5DP an analysis of RAID 5DP a qualitative and quantitative comparison of RAID levels and data protection hp white paper for information about the va 7000 series and periodic updates to this white paper see

More information

Nutanix Tech Note. Failure Analysis. 2013 All Rights Reserved, Nutanix Corporation

Nutanix Tech Note. Failure Analysis. 2013 All Rights Reserved, Nutanix Corporation Nutanix Tech Note Failure Analysis A Failure Analysis of Storage System Architectures Nutanix Scale-out v. Legacy Designs Types of data to be protected Any examination of storage system failure scenarios

More information

Using RAID6 for Advanced Data Protection

Using RAID6 for Advanced Data Protection Using RAI6 for Advanced ata Protection 2006 Infortrend Corporation. All rights reserved. Table of Contents The Challenge of Fault Tolerance... 3 A Compelling Technology: RAI6... 3 Parity... 4 Why Use RAI6...

More information

Fact Sheet FUJITSU Service Contract for FUJITSU M10 and Oracle SPARC Enterprise Servers

Fact Sheet FUJITSU Service Contract for FUJITSU M10 and Oracle SPARC Enterprise Servers Fact Sheet FUJITSU Service Contract for FUJITSU M10 and Oracle SPARC Enterprise Servers Maintenance and Support Services for the Server Hardware and the Solaris Operating System backed by Oracle Premier

More information

How to choose the right RAID for your Dedicated Server

How to choose the right RAID for your Dedicated Server Overview of RAID Let's first address, "What is RAID and what does RAID stand for?" RAID, an acronym for "Redundant Array of Independent Disks, is a storage technology that links or combines multiple hard

More information

RAID Made Easy By Jon L. Jacobi, PCWorld

RAID Made Easy By Jon L. Jacobi, PCWorld 9916 Brooklet Drive Houston, Texas 77099 Phone 832-327-0316 www.safinatechnolgies.com RAID Made Easy By Jon L. Jacobi, PCWorld What is RAID, why do you need it, and what are all those mode numbers that

More information

VERY IMPORTANT NOTE! - RAID

VERY IMPORTANT NOTE! - RAID Disk drives are an integral part of any computing system. Disk drives are usually where the operating system and all of an enterprise or individual s data are stored. They are also one of the weakest links

More information

Maintenance Best Practices for Adaptec RAID Solutions

Maintenance Best Practices for Adaptec RAID Solutions Maintenance Best Practices for Adaptec RAID Solutions Note: This document is intended to provide insight into the best practices for routine maintenance of Adaptec RAID systems. These maintenance best

More information

Factors rebuilding a degraded RAID

Factors rebuilding a degraded RAID Whitepaper Abstract This whitepaper introduces the procedure rebuilding a degraded RAID. You will find information about RAID levels and their rebuild procedures; rebuild time and its dependent factors.

More information

RAID-DP: NetApp Implementation of Double- Parity RAID for Data Protection

RAID-DP: NetApp Implementation of Double- Parity RAID for Data Protection Technical Report RAID-DP: NetApp Implementation of Double- Parity RAID for Data Protection Jay White & Chris Lueth, NetApp May 2010 TR-3298 ABSTRACT This document provides an in-depth overview of the NetApp

More information

PIONEER RESEARCH & DEVELOPMENT GROUP

PIONEER RESEARCH & DEVELOPMENT GROUP SURVEY ON RAID Aishwarya Airen 1, Aarsh Pandit 2, Anshul Sogani 3 1,2,3 A.I.T.R, Indore. Abstract RAID stands for Redundant Array of Independent Disk that is a concept which provides an efficient way for

More information

Education. Servicing the IBM ServeRAID-8k Serial- Attached SCSI Controller. Study guide. XW5078 Release 1.00

Education. Servicing the IBM ServeRAID-8k Serial- Attached SCSI Controller. Study guide. XW5078 Release 1.00 Education Servicing the IBM ServeRAID-8k Serial- Attached SCSI Controller Study guide XW5078 Release 1.00 May 2006 Servicing the IBM ServeRAID-8k Serial- Attached SCSI (SAS) Controller Overview The ServeRAID

More information

RAID for the 21st Century. A White Paper Prepared for Panasas October 2007

RAID for the 21st Century. A White Paper Prepared for Panasas October 2007 A White Paper Prepared for Panasas October 2007 Table of Contents RAID in the 21 st Century...1 RAID 5 and RAID 6...1 Penalties Associated with RAID 5 and RAID 6...1 How the Vendors Compensate...2 EMA

More information

RAID technology and IBM TotalStorage NAS products

RAID technology and IBM TotalStorage NAS products IBM TotalStorage Network Attached Storage October 2001 RAID technology and IBM TotalStorage NAS products By Janet Anglin and Chris Durham Storage Networking Architecture, SSG Page No.1 Contents 2 RAID

More information

Click on the diagram to see RAID 0 in action

Click on the diagram to see RAID 0 in action Click on the diagram to see RAID 0 in action RAID Level 0 requires a minimum of 2 drives to implement RAID 0 implements a striped disk array, the data is broken down into blocks and each block is written

More information

systems' resilience to disk failure through

systems' resilience to disk failure through BY Shashwath Veerappa Devaru CS615 Aspects of System Administration Using Multiple Hard Drives for Performance and Reliability RAID is the term used to describe a storage systems' resilience to disk failure

More information

Comprehending the Tradeoffs between Deploying Oracle Database on RAID 5 and RAID 10 Storage Configurations. Database Solutions Engineering

Comprehending the Tradeoffs between Deploying Oracle Database on RAID 5 and RAID 10 Storage Configurations. Database Solutions Engineering Comprehending the Tradeoffs between Deploying Oracle Database on RAID 5 and RAID 10 Storage Configurations A Dell Technical White Paper Database Solutions Engineering By Sudhansu Sekhar and Raghunatha

More information

Dynamic Disk Pools Delivering Worry-Free Storage

Dynamic Disk Pools Delivering Worry-Free Storage Dynamic Disk Pools Delivering Worry-Free Storage Dr. Didier Gava EMEA HPC Storage Architect MEW Workshop 2012 Liverpool, Germany Historic View Of RAID Advancement RAID 5 1987 Single disk failure protection

More information

RAID Technology White Paper

RAID Technology White Paper RAID Technology White Paper As specialists in data storage, LaCie recognizes that almost all computer users will need a storage or backup solution and that people use and store data in different ways.

More information

Data Storage - II: Efficient Usage & Errors

Data Storage - II: Efficient Usage & Errors Data Storage - II: Efficient Usage & Errors Week 10, Spring 2005 Updated by M. Naci Akkøk, 27.02.2004, 03.03.2005 based upon slides by Pål Halvorsen, 12.3.2002. Contains slides from: Hector Garcia-Molina

More information

XtremIO DATA PROTECTION (XDP)

XtremIO DATA PROTECTION (XDP) White Paper XtremIO DATA PROTECTION (XDP) Flash-Specific Data Protection, Provided by XtremIO (Ver..0) Abstract This white paper introduces the and discusses its benefits and advantages over RAID, with

More information

DELL RAID PRIMER DELL PERC RAID CONTROLLERS. Joe H. Trickey III. Dell Storage RAID Product Marketing. John Seward. Dell Storage RAID Engineering

DELL RAID PRIMER DELL PERC RAID CONTROLLERS. Joe H. Trickey III. Dell Storage RAID Product Marketing. John Seward. Dell Storage RAID Engineering DELL RAID PRIMER DELL PERC RAID CONTROLLERS Joe H. Trickey III Dell Storage RAID Product Marketing John Seward Dell Storage RAID Engineering http://www.dell.com/content/topics/topic.aspx/global/products/pvaul/top

More information

Technology Update White Paper. High Speed RAID 6. Powered by Custom ASIC Parity Chips

Technology Update White Paper. High Speed RAID 6. Powered by Custom ASIC Parity Chips Technology Update White Paper High Speed RAID 6 Powered by Custom ASIC Parity Chips High Speed RAID 6 Powered by Custom ASIC Parity Chips Why High Speed RAID 6? Winchester Systems has developed High Speed

More information

Inside Track Research Note. In association with. Data Protection and RAID. Modern business needs new storage protection

Inside Track Research Note. In association with. Data Protection and RAID. Modern business needs new storage protection Research Note In association with Data Protection and RAID Modern business needs new storage protection January 2015 In a nutshell About this The insights presented in this document are derived from independent

More information

GENERAL INFORMATION COPYRIGHT... 3 NOTICES... 3 XD5 PRECAUTIONS... 3 INTRODUCTION... 4 FEATURES... 4 SYSTEM REQUIREMENT... 4

GENERAL INFORMATION COPYRIGHT... 3 NOTICES... 3 XD5 PRECAUTIONS... 3 INTRODUCTION... 4 FEATURES... 4 SYSTEM REQUIREMENT... 4 1 Table of Contents GENERAL INFORMATION COPYRIGHT... 3 NOTICES... 3 XD5 PRECAUTIONS... 3 INTRODUCTION... 4 FEATURES... 4 SYSTEM REQUIREMENT... 4 XD5 FAMILULARIZATION... 5 PACKAGE CONTENTS... 5 HARDWARE

More information

ISTANBUL AYDIN UNIVERSITY

ISTANBUL AYDIN UNIVERSITY ISTANBUL AYDIN UNIVERSITY 2013-2014 Academic Year Fall Semester Department of Software Engineering SEN361 COMPUTER ORGANIZATION HOMEWORK REPORT STUDENT S NAME : GÖKHAN TAYMAZ STUDENT S NUMBER : B1105.090068

More information

Enhancements of ETERNUS DX / SF

Enhancements of ETERNUS DX / SF shaping tomorrow with you ETERNUS - Business-centric Storage Enhancements of ETERNUS DX / SF Global Product Marketing Storage ETERNUS Business-centric Storage Agenda: 1 Overview of the top 3 innovations

More information

RAID Implementation for StorSimple Storage Management Appliance

RAID Implementation for StorSimple Storage Management Appliance RAID Implementation for StorSimple Storage Management Appliance Alpa Kohli June, 2012 KB-00008 Document Revision 1 StorSimple knowledge base articles are intended to provide customers with the information

More information

Reliability and Fault Tolerance in Storage

Reliability and Fault Tolerance in Storage Reliability and Fault Tolerance in Storage Dalit Naor/ Dima Sotnikov IBM Haifa Research Storage Systems 1 Advanced Topics on Storage Systems - Spring 2014, Tel-Aviv University http://www.eng.tau.ac.il/semcom

More information

Intel RAID Controllers

Intel RAID Controllers Intel RAID Controllers Best Practices White Paper April, 2008 Enterprise Platforms and Services Division - Marketing Revision History Date Revision Number April, 2008 1.0 Initial release. Modifications

More information

Intransa EnterpriseServer and EnterpriseStorage Infrastructure for High Availability Needs V1.0

Intransa EnterpriseServer and EnterpriseStorage Infrastructure for High Availability Needs V1.0 Intransa EnterpriseServer and EnterpriseStorage Infrastructure for High Availability Needs V1.0 Introduction This document is designed to provide the reader with an overview of Intransa s High Availability

More information

Datasheet Fujitsu ETERNUS DX80 S2 Disk Storage System

Datasheet Fujitsu ETERNUS DX80 S2 Disk Storage System Datasheet Fujitsu ETERNUS DX80 S2 Disk Storage System The Flexible Data Safe for Dynamic Infrastructures. ETERNUS DX S2 DISK STORAGE SYSTEMS The Fujitsu second generation of ETERNUS DX disk storage systems,

More information

RAID 5 rebuild performance in ProLiant

RAID 5 rebuild performance in ProLiant RAID 5 rebuild performance in ProLiant technology brief Abstract... 2 Overview of the RAID 5 rebuild process... 2 Estimating the mean-time-to-failure (MTTF)... 3 Factors affecting RAID 5 array rebuild

More information

Using RAID Admin and Disk Utility

Using RAID Admin and Disk Utility Using RAID Admin and Disk Utility Xserve RAID Includes instructions for creating RAID arrays and monitoring Xserve RAID systems K Apple Computer, Inc. 2003 Apple Computer, Inc. All rights reserved. Under

More information

BrightStor ARCserve Backup for Windows

BrightStor ARCserve Backup for Windows BrightStor ARCserve Backup for Windows Tape RAID Option Guide r11.5 D01183-1E This documentation and related computer software program (hereinafter referred to as the "Documentation") is for the end user's

More information

RAID Rebuilding. Objectives CSC 486/586. Imaging RAIDs. Imaging RAIDs. Imaging RAIDs. Multi-RAID levels??? Video Time

RAID Rebuilding. Objectives CSC 486/586. Imaging RAIDs. Imaging RAIDs. Imaging RAIDs. Multi-RAID levels??? Video Time Objectives 00:13 CSC 486/586 RAID Rebuilding In your previous module, you learned about RAID technology, including hardware and software RAIDs. In this module you will learn about the issues you need to

More information

Sonexion GridRAID Characteristics

Sonexion GridRAID Characteristics Sonexion GridRAID Characteristics Mark Swan Performance Team Cray Inc. Saint Paul, Minnesota, USA mswan@cray.com Abstract This paper will present performance characteristics of the Sonexion declustered

More information

MICROSOFT EXCHANGE 2003. best practices BEST PRACTICES - DATA STORAGE SETUP

MICROSOFT EXCHANGE 2003. best practices BEST PRACTICES - DATA STORAGE SETUP MICROSOFT EXCHANGE 2003 best practices BEST PRACTICES - DATA STORAGE SETUP TABLE OF CONTENTS E-mail has become a business critical communication tool 3 Build a disaster recovery solution with VSS and Data

More information

RAID-DP : NETWORK APPLIANCE IMPLEMENTATION OF RAID DOUBLE PARITY FOR DATA PROTECTION A HIGH-SPEED IMPLEMENTATION OF RAID 6

RAID-DP : NETWORK APPLIANCE IMPLEMENTATION OF RAID DOUBLE PARITY FOR DATA PROTECTION A HIGH-SPEED IMPLEMENTATION OF RAID 6 RAID-DP : NETWORK APPLIANCE IMPLEMENTATION OF RAID DOUBLE PARITY FOR DATA PROTECTION A HIGH-SPEED IMPLEMENTATION OF RAID 6 Chris Lueth, Network Appliance, Inc. TR-3298 [12/2006] ABSTRACT To date, RAID

More information

RAID: Redundant Arrays of Independent Disks

RAID: Redundant Arrays of Independent Disks RAID: Redundant Arrays of Independent Disks Dependable Systems Dr.-Ing. Jan Richling Kommunikations- und Betriebssysteme TU Berlin Winter 2012/2013 RAID: Introduction Redundant array of inexpensive disks

More information

IBM ^ xseries ServeRAID Technology

IBM ^ xseries ServeRAID Technology IBM ^ xseries ServeRAID Technology Reliability through RAID technology Executive Summary: t long ago, business-critical computing on industry-standard platforms was unheard of. Proprietary systems were

More information

Getting Started With RAID

Getting Started With RAID Dell Systems Getting Started With RAID www.dell.com support.dell.com Notes, Notices, and Cautions NOTE: A NOTE indicates important information that helps you make better use of your computer. NOTICE: A

More information

EqualLogic PS Series Storage Arrays: Choosing a Member RAID Policy

EqualLogic PS Series Storage Arrays: Choosing a Member RAID Policy Technical Report EqualLogic PS Series Storage Arrays: Choosing a Member RAID Policy Abstract This Technical Report describes the supported RAID policies for Dell EqualLogic arrays. This report also provides

More information

CS420: Operating Systems

CS420: Operating Systems NK YORK COLLEGE OF PENNSYLVANIA HG OK 2 RAID YORK COLLEGE OF PENNSYLVAN James Moscola Department of Physical Sciences York College of Pennsylvania Based on Operating System Concepts, 9th Edition by Silberschatz,

More information

RAID Utility User Guide. Instructions for setting up RAID volumes on a computer with a Mac Pro RAID Card or Xserve RAID Card

RAID Utility User Guide. Instructions for setting up RAID volumes on a computer with a Mac Pro RAID Card or Xserve RAID Card RAID Utility User Guide Instructions for setting up RAID volumes on a computer with a Mac Pro RAID Card or Xserve RAID Card Contents 3 RAID Utility User Guide 3 The RAID Utility Window 4 Running RAID Utility

More information

IBM Spectrum Scale vs EMC Isilon for IBM Spectrum Protect Workloads

IBM Spectrum Scale vs EMC Isilon for IBM Spectrum Protect Workloads 89 Fifth Avenue, 7th Floor New York, NY 10003 www.theedison.com @EdisonGroupInc 212.367.7400 IBM Spectrum Scale vs EMC Isilon for IBM Spectrum Protect Workloads A Competitive Test and Evaluation Report

More information

StoreVault Advanced Protection Architecture

StoreVault Advanced Protection Architecture StoreVault Advanced Protection Architecture NetApp technologies working together Advanced data protection Advanced system protection Introduction Advanced Data Protection Overview NetApp Snapshot Technology

More information

RAID Utility User s Guide Instructions for setting up RAID volumes on a computer with a MacPro RAID Card or Xserve RAID Card.

RAID Utility User s Guide Instructions for setting up RAID volumes on a computer with a MacPro RAID Card or Xserve RAID Card. RAID Utility User s Guide Instructions for setting up RAID volumes on a computer with a MacPro RAID Card or Xserve RAID Card. 1 Contents 3 RAID Utility User s Guide 3 Installing the RAID Software 4 Running

More information

Intel RAID Volume Recovery Procedures

Intel RAID Volume Recovery Procedures Intel RAID Volume Recovery Procedures Revision 1.0 12/20/01 Revision History Date Revision Number 12/20/01 1.0 Release Modifications Disclaimers Information in this document is provided in connection with

More information

About RAID. RAID for performance. How it increases performance. How it makes file storage cheaper. Drawbacks

About RAID. RAID for performance. How it increases performance. How it makes file storage cheaper. Drawbacks www.gateway.com About RAID About RAID RAID (Redundant Array of Inexpensive/Independent Disks) lets your computer use multiple hard drives more efficiently. Your computer supports RAID 0, RAID 1, RAID 5,

More information

an introduction to networked storage

an introduction to networked storage an introduction to networked storage How networked storage can simplify your data management The key differences between SAN, DAS, and NAS The business benefits of networked storage Introduction Historical

More information

3PAR Fast RAID: High Performance Without Compromise

3PAR Fast RAID: High Performance Without Compromise 3PAR Fast RAID: High Performance Without Compromise Karl L. Swartz Document Abstract: 3PAR Fast RAID allows the 3PAR InServ Storage Server to deliver higher performance with less hardware, reducing storage

More information

RAID. Storage-centric computing, cloud computing. Benefits:

RAID. Storage-centric computing, cloud computing. Benefits: RAID Storage-centric computing, cloud computing. Benefits: Improved reliability (via error correcting code, redundancy). Improved performance (via redundancy). Independent disks. RAID Level 0 Provides

More information

TECHNOLOGY BRIEF. Compaq RAID on a Chip Technology EXECUTIVE SUMMARY CONTENTS

TECHNOLOGY BRIEF. Compaq RAID on a Chip Technology EXECUTIVE SUMMARY CONTENTS TECHNOLOGY BRIEF August 1999 Compaq Computer Corporation Prepared by ISSD Technology Communications CONTENTS Executive Summary 1 Introduction 3 Subsystem Technology 3 Processor 3 SCSI Chip4 PCI Bridge

More information

Recovering from a Hard Drive Failure

Recovering from a Hard Drive Failure APPENDIXB This appendix describes how to recover from a hard drive failure on a Multiservices Platform Series device. The process for doing so depends on the physical security product that you are using

More information

Which RAID Level is Right for Me?

Which RAID Level is Right for Me? STOR SOUTOS WT R Which R evel is Right for e? ontents ntroduction...1 R evel escriptions...1 R 0 ()...1 R 1 (irroring)...2 R 1 (Striped irror)...2 R 5 ( with parity)...2 R 5 (ot Space)...3 R 6 ( with dual

More information

Fact Sheet Fujitsu Revenue Management Solution for the Wholesale Distribution Industry

Fact Sheet Fujitsu Revenue Management Solution for the Wholesale Distribution Industry Fact Sheet Fujitsu Revenue Management Solution for the Wholesale Distribution Industry Fujitsu Revenue Management Solution manages end to end supply chain management. This solution integrates demand planning,

More information

SSDs and RAID: What s the right strategy. Paul Goodwin VP Product Development Avant Technology

SSDs and RAID: What s the right strategy. Paul Goodwin VP Product Development Avant Technology SSDs and RAID: What s the right strategy Paul Goodwin VP Product Development Avant Technology SSDs and RAID: What s the right strategy Flash Overview SSD Overview RAID overview Thoughts about Raid Strategies

More information

USER GUIDE. PageScope Enterprise Suite. Backup and Recovery

USER GUIDE. PageScope Enterprise Suite. Backup and Recovery PageScope Enterprise Suite Backup and Recovery USER GUIDE Date : 07/31/2008 Written by: Tony Gliatta, Vartkes Tashjian and Rob Posenato Location: CEC Lab, HQ Ramsey, NJ Table of Content Chapter 1 PageScope

More information

An Introduction to RAID 6 ULTAMUS TM RAID

An Introduction to RAID 6 ULTAMUS TM RAID An Introduction to RAID 6 ULTAMUS TM RAID The highly attractive cost per GB of SATA storage capacity is causing RAID products based on the technology to grow in popularity. SATA RAID is now being used

More information

EMC Backup and Recovery for Microsoft SQL Server 2008 Enabled by EMC Celerra Unified Storage

EMC Backup and Recovery for Microsoft SQL Server 2008 Enabled by EMC Celerra Unified Storage EMC Backup and Recovery for Microsoft SQL Server 2008 Enabled by EMC Celerra Unified Storage Applied Technology Abstract This white paper describes various backup and recovery solutions available for SQL

More information

Disk Array Data Organizations and RAID

Disk Array Data Organizations and RAID Guest Lecture for 15-440 Disk Array Data Organizations and RAID October 2010, Greg Ganger 1 Plan for today Why have multiple disks? Storage capacity, performance capacity, reliability Load distribution

More information

Moving Beyond RAID DXi and Dynamic Disk Pools

Moving Beyond RAID DXi and Dynamic Disk Pools TECHNOLOGY BRIEF Moving Beyond RAID DXi and Dynamic Disk Pools NOTICE This Technology Brief contains information protected by copyright. Information in this Technology Brief is subject to change without

More information

QuickSpecs. HP Smart Array 5312 Controller. Overview

QuickSpecs. HP Smart Array 5312 Controller. Overview Overview Models 238633-B21 238633-291 (Japan) Feature List: High Performance PCI-X Architecture High Capacity Two Ultra 3 SCSI channels support up to 28 drives Modular battery-backed cache design 128 MB

More information

Practical issues in DIY RAID Recovery

Practical issues in DIY RAID Recovery www.freeraidrecovery.com Practical issues in DIY RAID Recovery Based on years of technical support experience 2012 www.freeraidrecovery.com This guide is provided to supplement our ReclaiMe Free RAID Recovery

More information

Fujitsu Interstage Business Operations Platform: Case Management

Fujitsu Interstage Business Operations Platform: Case Management Fujitsu Interstage Business Operations Platform: Case Management Leverage Knowledge in the Enterprise 02 The Fujitsu Interstage Business Operations Platform (BOP) is a next-generation business solution

More information

RAID EzAssist Configuration Utility Quick Configuration Guide

RAID EzAssist Configuration Utility Quick Configuration Guide RAID EzAssist Configuration Utility Quick Configuration Guide DB15-000277-00 First Edition 08P5520 Proprietary Rights Notice This document contains proprietary information of LSI Logic Corporation. The

More information

Smart Storage and Modern Data Protection Built for Virtualization

Smart Storage and Modern Data Protection Built for Virtualization Smart Storage and Modern Data Protection Built for Virtualization Dot Hill Storage Arrays and Veeam Backup & Replication Software offer the winning combination. Veeam and Dot Hill Solutions Introduction

More information

Business-centric Storage FUJITSU Storage ETERNUS CS800 Data Protection Appliance

Business-centric Storage FUJITSU Storage ETERNUS CS800 Data Protection Appliance Business-centric Storage FUJITSU Storage ETERNUS CS800 Data Protection Appliance The easy solution for backup to disk with deduplication If you rethink your backup strategy, then think of ETERNUS CS800

More information

Why disk arrays? CPUs improving faster than disks

Why disk arrays? CPUs improving faster than disks Why disk arrays? CPUs improving faster than disks - disks will increasingly be bottleneck New applications (audio/video) require big files (motivation for XFS) Disk arrays - make one logical disk out of

More information

RAID HARDWARE. On board SATA RAID controller. RAID drive caddy (hot swappable) SATA RAID controller card. Anne Watson 1

RAID HARDWARE. On board SATA RAID controller. RAID drive caddy (hot swappable) SATA RAID controller card. Anne Watson 1 RAID HARDWARE On board SATA RAID controller SATA RAID controller card RAID drive caddy (hot swappable) Anne Watson 1 RAID The word redundant means an unnecessary repetition. The word array means a lineup.

More information

Storage Technologies - 2

Storage Technologies - 2 Antoniu Pop 1 The University of Manchester COMP 25212 Storage Technologies - 2 Antoniu Pop antoniu.pop@manchester.ac.uk 16 April 2015 Antoniu Pop 2 The University of Manchester COMP 25212 Storage Technologies

More information

USER S GUIDE. MegaRAID SAS Software. June 2007 Version 2.0. 80-00156-01, Rev. B

USER S GUIDE. MegaRAID SAS Software. June 2007 Version 2.0. 80-00156-01, Rev. B USER S GUIDE MegaRAID SAS Software June 2007 Version 2.0 80-00156-01, Rev. B This document contains proprietary information of LSI Corporation. The information contained herein is not to be used by or

More information

Xyratex Update. Michael K. Connolly. Partner and Alliances Development

Xyratex Update. Michael K. Connolly. Partner and Alliances Development Xyratex Update Michael K. Connolly Partner and Alliances Development Is Now 2 The Continued Power of Xyratex Global Solutions Provider of High Quality Data Storage Hardware, Software and Services Broad

More information

CS161: Operating Systems

CS161: Operating Systems CS161: Operating Systems Matt Welsh mdw@eecs.harvard.edu Lecture 18: RAID April 19, 2007 2007 Matt Welsh Harvard University 1 RAID Redundant Arrays of Inexpensive Disks Invented in 1986-1987 by David Patterson

More information

1 Storage Devices Summary

1 Storage Devices Summary Chapter 1 Storage Devices Summary Dependability is vital Suitable measures Latency how long to the first bit arrives Bandwidth/throughput how fast does stuff come through after the latency period Obvious

More information

Computer Organization II. CMSC 3833 Lecture 61

Computer Organization II. CMSC 3833 Lecture 61 RAID, an acronym for Redundant Array of Independent Disks was invented to address problems of disk reliability, cost, and performance. In RAID, data is stored across many disks, with extra disks added

More information

Hot-Plug Disk Drive Removal and Replacement Guidelines for Compaq Smart Array Controllers

Hot-Plug Disk Drive Removal and Replacement Guidelines for Compaq Smart Array Controllers White Paper November 1999 Prepared by Storage Products Division Compaq Computer Corporation Contents Rapid Recovery with Hot- Plug Drives...3 Guidelines when hotplugging a drive...3 Guidelines when Insight

More information

HP Smart Array Controllers and basic RAID performance factors

HP Smart Array Controllers and basic RAID performance factors Technical white paper HP Smart Array Controllers and basic RAID performance factors Technology brief Table of contents Abstract 2 Benefits of drive arrays 2 Factors that affect performance 2 HP Smart Array

More information

Distribution One Server Requirements

Distribution One Server Requirements Distribution One Server Requirements Introduction Welcome to the Hardware Configuration Guide. The goal of this guide is to provide a practical approach to sizing your Distribution One application and

More information

Disaster Recovery for Small Businesses

Disaster Recovery for Small Businesses Technical White Paper Disaster Recovery for Small Businesses A disaster recovery plan helps you understand what data is critical to your business operations and how to best protect it from unexpected failures.

More information

Lecture 36: Chapter 6

Lecture 36: Chapter 6 Lecture 36: Chapter 6 Today s topic RAID 1 RAID Redundant Array of Inexpensive (Independent) Disks Use multiple smaller disks (c.f. one large disk) Parallelism improves performance Plus extra disk(s) for

More information