A Primer on Nearline and Archival Storage Solutions
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1 WHITE PAPER A Primer on Nearline and Archival Storage Solutions Nearline storage represents the position in the storage hierarchy between online and offline storage. Nearline storage bridges the gap in cost and performance between fast online and slow offline storage. Nearline storage is almost instantaneously accessible through the use of automated robotics-based removable media handling. Explosive Data Growth The value of nearline storage has been prompted by the phenomenal growth of electronic data in recent years. Solutions such as document management system (DMS) and customer relationship management (CRM) and applications such as imaging, , multimedia, databases and e-commerce are contributing to the explosive data growth at the enterprise level. Organizations are now doubling the amount of their data every 12 to 18 months. This ongoing need to store more and more data is creating additional inefficiencies, as the infrastructure requirements for storage management are unable to keep up with the growth in data storage. Figure 1 The rise of electronic data growth (data source IDC and SNIA) 1
2 Concerns and Issues Backup Issues The explosive growth in data is resulting in longer backup cycles and complicated backup methodologies. This is becoming problematic given that organizations have smaller windows of opportunity to conduct backup operations. Reasons for this include: Increasing access requirements and 24 x 7 operations. If storage requirements are doubling every months then the load on the backup system will also be doubling every months. Backup system scalability is not an easy undertaking at the best of times. It has become even more difficult to scale given that the data load is constantly growing. Unless we can either reduce the amount of data that regularly gets backed up, or increase the allocated time for backup operations, we are heading down a dangerous path where backup jobs are not regularly run. This leads to a low probability of successful data backups and an unpredictable ability to recover data. Scenario Cost of data recovery XYZ Tax Services generates $10,000,000 per year from preparing tax returns using their own tax software application. 1,000 tax specialists regularly use the software to generate revenue for XYZ. The average hourly wage for an XYZ employee is $15/hour. The business operates 100 days per year and a typical outage would result in 20% of the data being lost. Let s assume an average data recovery time of 4 hours should the system go down. This recovery time typically includes identification of lost data, locating it on backup media and restoration to primary storage. Recovery costs average $20,000. However this recovery cost does not truly represent the cost of the down time to the company. There are two other costs to consider: The cost of lost data and the opportunity cost associated with employees getting paid for work they are not able to perform. Annual Revenue Average Cost of Lost Data = % of Data Lost = = OperatingCost $20,000 2
3 Opportunity Cost = Employee Time Lost = Average Data Recovery Time Average Hourly Rate Number of Employees = $60,000 Figure 2 - Cost of Outage, % of Total Revenue and Incidents/year for XYZ Tax Service (Data Source SNIA) As outlined in above example, few outages during a year can cause significant impact on the bottom line of the companies. Business Industry Hourly Downtime Cost Brokerage Operations Finance $6,450,000 Credit Card Sales Authorization Finance $2,600,000 Pay-per-view Media $150,000 Home Shopping (TV) Retail $113,000 Catalog Sales Retail $90,000 Airline Reservation Transport $90,000 Tele-ticket Sales Media $69,000 Package Shipping Transport $28,000 ATM fees Finance $14,500 Source: Fibre Channel Industry Association Table 1 Typical hourly downtime cost for businesses 3
4 Inactive Data As the amount of data storage grows, so too does the amount of inactive data. Studies consistently show that only a small portion of data is frequently accessed. A typical file server contains 20% active data and 80% inactive data. This implies a non-optimal use of primary storage resources. One of the major reasons why organizations generate significant amounts of inactive data is because organizations tend to add capacity without taking into consideration the management of data and what gets stored where. Vendors are only interested in promoting larger and faster storage solutions without a proper management mechanism in place. In essence, there is a lack of best practices for data and storage management. Because of the tremendous time pressures IT administrators are often under, they often don t take the time to plan for moving or migrating data that is no longer current, or infrequently accessed. Figure 3 80% of the data in a typical File Server is accessed infrequently Aged Data In most instances, the value and relevance of data to an organization decreases over time. Aged data may continue to be stored for extended time periods due to taxation, regulatory or other businessrelated reasons. However, maintaining inactive and aged data on online storage resources is both unproductive and costly. There is a tremendous need to implement a suitable storage strategy to handle most of an organization s inactive and aged data. 4
5 Figure 4 Value of Data with Time Storage Cost Inactive data creates longer backup windows, requiring greater resources and increased management costs. It also results in longer recovery times. Keeping rarely accessed data online can be very expensive for several reasons. With the rapid decline in prices of online storage such as NAS devices, it may appear that online storage is very inexpensive. The hardware cost alone doesn t show a complete picture. Total Cost of Ownership (TCO) based comparison includes hard costs such as cost of hardware, software, and maintenance and soft costs such as management cost for monitoring, scheduling, reviewing, managing off-site vaulting, installing and configuration of new hardware. An analysis based on TCO will show that online storage is much more expensive than either nearline and offline storage. Typically online storage capacity is not scalable without purchasing another online storage device. Whereas purchasing additional media at a fraction of the cost can expand the capacity of nearline and offline storage devices. As well, one also has to consider the costs due to the disruption in operations. This occurs all to often when organizations run out of space on their online storage devices because of the explosive growth of their data. 5
6 DAS Distributed DAS Centralized Virtualized Centralized Figure 5 Storage Management with various storage strategies Up until now, majority of organizations have implemented a distributed management strategy for their direct-attached storage (DAS) infrastructure. This is a simple strategy that comes with high management cost. With this strategy, the storage management cost as well as administrative complexity grows with growth in storage capacity. The centralization of storage management activities offers improved total cost of management. Centralized DAS infrastructure management strategy has the potential to allow administrators to manage twice the storage capacity managed in distributed DAS infrastructure using the same resources. This strategy can result in a reduction of 40% in management cost. The pooling of storage virtualization offers further improvement in total cost of management of storage infrastructure. A centralized and virtualized storage environment has potential to allow administrators to manage eight times more storage capacity while reducing the management cost by 70% over a distributed DAS environment. Overall, the cost of managing storage far exceeds the cost of storage hardware. 6
7 Nearline Storage to the Rescue Organizations can save significant amounts of time and money by migrating less frequently accessed data to nearline storage devices such as automated jukeboxes and libraries for removable storage media. The key point to note here is that there is no significant performance loss through data migration, the system becomes more efficient and nearline storage offers relatively fast data accessibility. It s a win-win situation! Clients Media Library Storage Server Figure 6 A typical nearline storage solution User Impact With most nearline storage solutions, users and applications are unaware of the physical data location. As well, the mapping of logical storage objects to physical storage objects is transparent to users. The data always appears to be online and the logical storage object appears to have near-infinite storage capacity. The individual or group of removable storage media appears as logical storage objects. Nearline storage solutions allow archived inactive data to be accessible to users and applications while devoting online storage to active data. The only concern is the potential delay times in accessing the data, which has been migrated to removable media. This concern can be greatly alleviated by using a removable storage system that provides reasonable access time. Sometimes, users and applications need to know where to look for archived and migrated data. Administrators must keep this in mind when setting up their storage environments. 7
8 Elimination of Inactive Data from Backups This solution reduces the backup time and in turn management cost by eliminating the repetitive backup of static data. A copy of the static data can be created and removed from a jukebox for off-site storage for disaster recovery purposes. Only new data gets backed up. The elimination of migrated data from backup cycle can reduce backup time by as much as 90%. Incremental backup solutions also reduce the backup time by only backing up new or modified data since last backup. But this reduction in backup time comes with a drawback of longer data recovery time. Complete data restore operation require restoration of a full backup set along with restoration of all incremental backup sets saved since the last full backup. Incorporating Limitless Storage Capacity Storage capacity can be increased and organized by incorporating additional removable media. It appears to users and applications that they have access to limitless storage capacity. This is because when a piece of media is full you have the option of storing it offsite and putting a fresh piece of media back into the storage device. A Cost Effective Solution This solution offers increased media utilization and better data manageability. It focuses on better storage resource utilization for active data and a decreased need to add online storage. Centralized management functionality and elimination of duplication of resources also result in administrative cost savings. Nearline Storage Applications Typical applications where a nearline storage approach is extensively used are: Government data archiving, storage of medical records, financial records and document imaging files, and document management systems. In many cases it is a legal requirement that data be preserved on storage media that has long-term data integrity (i.e. Magneto-optical, DVD, CD, WORM). For example, imagine a busy medical facility and 8
9 the needs to accurately track and store the medical history of its patients. By law, medical records have to be stored for 7 years on an approved storage media. It is not only important to be able to access this information from the patient perspective, but it can also have tremendous consequences in the case of malpractice lawsuits. Three key strategies for adopting a nearline storage approach are: Archival Strategy, Data Migration Strategy and Data Preservation Strategy. Archival Strategy With an archival strategy there are two separate solutions - one for managing the archiving and retrieval of information and another for managing the secondary storage sub-system. Both solutions must work together seamlessly. By utilizing archival software, the primary archiving concern of needing to know where to look for archived data is no longer an issue. Typically, the archival software populates a database with information about the archived data on a secondary storage device. The management software manages the secondary media in the library and fulfils requests from the archival software for archiving or retrieving the data from specific media. Data Migration Strategy A data migration strategy is important when considering what data should be stored on what storage device. Generally speaking data is migrated from primary to secondary storage devices if it is not considered to be mission-critical or it is infrequently accessed. A sound data migration strategy enables organizations to conserve resources on more expensive, faster devices as well as to store files with similar attributes on the same device. Data migration software runs on a server, which determines what data to migrate to secondary storage based on policies set by an administrator. Policies are set to distribute various types of data, based on accessibility and usefulness, to appropriate storage devices. The automatic data migration functionality allows active data to remain on online storage while keeping archived data on secondary storage. Secondary storage is accessible to users and applications without human intervention -the data always appears to be online. This strategy requires a secondary storage system that provides access to data within a reasonable timeframe. 9
10 For example, imagine a busy medical facility that needs to store its medical files in a convenient and accessible electronic form. Assume that the facility s IT administrator has implemented a data migration strategy. The facility s frequently accessed files might be stored in a RAID tower while those files that are less frequently accessed would be stored in an optical jukebox. A policy could be set such that any medical file, which hadn t been accessed in at least 10 days, would automatically be migrated from the RAID tower to the optical jukebox. File Disposal Data Creation Offline Storage Cache Nearline Storage Online Storage Figure 7 File Lifecycle A data migration strategy allows efficient utilization of existing online storage capacity and dynamic changes in storage capacity without access disruption. Data Preservation Strategy One advantage of a nearline storage solution is that a long-term data preservation strategy can also be implemented without the need for a separate hardware solution. Typically this strategy is used for preserving information which needs to be stored for very long time periods (i.e. 7 to 15 years) such as government records, scientific data, corporate and business requirements and regulatory compliance information. The aforementioned data can be stored on Write-Once-Read-Many (WORM) media such as WORM MO, CD-R and DVD-R for long-term preservation. 10
11 Types of Archival Media Media Capacity CD-R MB CD-RW MB DVD-RAM Up to 9.4GB Rewritable (RW) /Writeonce (WO) Doublesided Comments WO No Good for personal data storage, archiving and distribution RW; up to 1,000 times RW; up to 100,000 times DVD-RW 4.7GB RW; up to 1,000 times No Yes, Type I and IV only No Ideal for personal data storage, multimedia presentations, and digital image storage Fast data access; slow data transfer rate Sequential read/write media; designed for video recording and streaming DVD-R 4.7GB WO No Compatible with CLV (constant linear velocity video) and CAV (constant angular velocity computer data) 5.25 MO Rewritable 5.25 MO WORM 12 Optical WORM 9.1GB 9.1GB RW; archival life 40 years or more WO; archival life 40 years or more Yes Yes Faster than DVD-RAM with comparable capacity; Ideal for applications demanding large capacity archiving Ideal for audit trails and jukebox use; Good solution for archiving financial, legal and medical files where audit trail or development of file is important 30GB WO Yes Drives can read both sides of disk simultaneously; fastest data access time; high cost 5.25 UDO 30GB RW; WO WO has archival life 50 years or more 5.25 PDD 23.3GB RW; WO WO has archival life 50 years or more MO Magneto-Optical RW Rewritable WO Write Once WORM Write Once Read Many UDO Ultra Density Optical PDD Sony Professional Disk for Data Yes No Higher capacity follow-on to MO with better integrity and performance. Uses blue laser technology. Higher capacity follow-on to MO with better integrity and performance. Uses blue laser technology. Table 2 - Types of Archival Media Solutions, which are capable of writing to WORM media as well as Rewritable media, can use the same library hardware. No additional hardware purchases are required for the two media types. 11
12 By implementing a data preservation strategy, data can remain online in the library if frequent access is required. The data can also be exported for offline/offsite storage if it is rarely accessed. This approach allows more secondary storage media to be inserted into the library. Nearline Storage Management Solutions from KOM NETWORKS KOM NETWORKS Enterprise Storage Solutions provide comprehensive storage management with unprecedented flexibility, reliability, and availability to your applications. Figure 8 - KOM Nearline Optical Storage Management Products Whether you are financial or insurance organization, government or medical institution through KOM NETWORKS solutions you will maximize your return on investment (ROI), minimize your corporate risks and insure your business continuity. 12
13 All KOM NETWORKS nearline storage solutions offer: Easy Device Integration and Installation KOM storage solutions allow for seamless integration of removable storage devices into the host operating system. The installation procedure is quick and easy allowing administrators to begin utilizing the solution within a very short period of time. Complete Device Control KOM storage solutions give you complete control over your nearline storage devices, permitting you to setup all parameters to suite your specific situation including online import and export. Effective Hardware Management Nearline storage devices can remain in production by allowing the flexibility of taking defective components offline until suitable downtimes are scheduled for repairs. Transparent Disk Management KOM storage solutions utilize the administrative tools of host operating system to provide transparent disk management functionalities create, format, assign drive letters and share names. Media Portability Removable media is treated as standard magnetic disk without a need for an external database to access data on the media. Native File System Support KOMworx/OptiStorm Edition, OPTISERVER and OPTIFILE based solutions do not use a proprietary file system, enabling you to format your removable storage media using the native file system. This extends most native file system features applicable to fixed magnetic disks including long filename support and file-level security to removable optical disks. KOMworx /OPTISTORM Edition KOMWORX /OE is a proven nearline optical storage software solution for Windows environments. It readily integrates into your current storage 13
14 environment and ensures that your data is always accessible and secure. KOMWORX /OE offers: Drive Name Technology KOMWORX /OE utilizes KOM patented drive name technology. This feature provides for a virtually limitless number of storage volumes to be online and accessible without the restriction of standard 26 drive letters. Single and Multiple Surface Storage Volume KOMWORX /OE gives you the flexibility to choose between creating one large volume spanning several removable optical platters or creating storage volumes comprised of only one surface of removable media. Flexible Caching KOMWORX /OE provides sophisticated but flexible caching functionalities to optimize read and write performance to the nearline storage devices. It allows for efficient use of nearline storage device and timely access to data. Offline Media Management This feature enables administrators to keep track of media that have been exported from a nearline storage device and allows for offline media notification and management. KOMWORX /OE delivers: Ensures high return-on-investment (ROI) with its flexibility to grow with your organization s needs. Support for Magneto-Optical (MO) Rewritable and Write-Once- Read-Many (WORM), 12 Optical WORM, CD-ROM, DVD-ROM DVD-RAM, UDO and Sony PDD. Supports native NTFS and FAT file system formats allowing enforcement of operating system (OS) security and media portability. Remote administration enabling optical storage management tasks from one central location on the corporate network. 14
15 Multiple access methods to data on the removable optical media in the jukeboxes Drive letters, UNC Pathname, Mount Points (similar to UNIX environment) and Drive Name, a KOM NETWORKS patented technology for accessing data on removable media. Improved read/write performance with Hierarchical Cache Management (HCM). KOM NETWORKS patented user access control technology to provide enhanced data protection against user errors, viruses, worms and hackers. Ability to permanently freeze a WORM media to meet the rigorous requirement of preventing after the fact new data writing such as creating a past fictitious banking transaction after discovery of no transaction or creating winning lottery numbers after the numbers are drawn. Time travel feature on WORM for audit trail and tracking file content development lifecycle. OPTISERVER for UNIX and OPTIFILE OpenVMS OPTISERVER for UNIX and OPTIFILE OpenVMS are nearline optical storage software solutions for HP-UX, Sun Solaris (SPARC/Intel) and Tru64 UNIX, and Alpha and VAX OpenVMS environments. OPTISERVER and OPTIFILE offer: Seamless Integration Both products integrate seamlessly into UNIX and OpenVMS platforms respectively. It allows data to be written directly to optical disks, without the need to first write files to magnetic disks. True Device Driver Both function as a true device driver and integrate nearline storage devices into your host system. The users continue to apply standard system utilities to nearline data storage operations. 15
16 Both products deliver: High return-on-investment (ROI) with its flexibility to grow with your organization s needs. Support for Magneto-Optical (MO) Rewritable and Write-Once- Read-Many (WORM), 12 Optical WORM, CD-ROM, DVD-ROM and DVD-RAM. Supports native file system formats (UFS, Files-11, etc.) allowing enforcement of operating system (OS) security and media portability. Ability to permanently freeze a WORM media to meet the rigorous requirement of preventing after the fact new data writing such as creating a past fictitious banking transaction after discovery of no transaction or creating winning lottery numbers after the numbers are drawn. Time travel feature on WORM media for audit trail and tracking file content development lifecycle. 16
17 KOMworx /Enterprise Edition KOMWORX /EE brings a breakthrough storage pooling technology to nearline optical storage devices. With KOMWORX /EE you get a phenomenal storage management facilities and significant return on investment through the flexibility to expand or shrink your storage environment, and the ability to seamlessly implement a long-term data storage strategy. Operational efficiency is improved through automated file migration policies that transparently move files between storage devices. KOMWORX /EE operates in a Windows 2000 environment and supports other operating systems by presenting access to its storage volumes through standards such as CIFS and NFS. KOMWORX /EE delivers Maximum return on investment (ROI) with efficient utilization of your existing removable storage devices. Effective storage pooling technology to integrate different type of removable optical media and devices in to one homogeneous storage repository. Dynamic expansion and shrinkage of storage volume capacity with no user access interruption. Retirement of old removable storage devices and addition of new removable storage devices without system downtime. Remote administration enabling optical storage management tasks from one central location on the corporate network The KOM NETWORKS logo, OPTISTORM, OPTISERVER, OPTIWORX, SHIELDWORX and KOMWORX, are trademarks of KOM NETWORKS Inc. KOM NETWORKS Inc. disclaims any proprietary interest in trademarks and trade names other than its own. KOM NETWORKS Inc. Phone: (613) Fax: (613) Sales: Support: info@komnetworks.com 17
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