Performance Tuning Guide

Transcription

1 IBM Tioli Storage Manager Version 6.3 Performance Tuning Guide GC

2

3 IBM Tioli Storage Manager Version 6.3 Performance Tuning Guide GC

4 Note: Before using this information and the product it supports, read the information in Notices on page 73. This edition applies to Version 6.3 of IBM Tioli Storage Manager (product number 5608-E01, 5608-E02, 5608-E03, 5608-E07, 5608-E12), and to all subsequent releases and modifications until otherwise indicated in new editions or technical newsletters. This edition replaces GC Copyright IBM Corporation 1996, US Goernment Users Restricted Rights Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.

5 Contents Preface Who should read this guide Publications Tioli Storage Manager publications..... Tioli Storage FlashCopy Manager publications iii Support information iii Getting technical training iii Searching knowledge bases ix Contacting IBM Software Support xi New for IBM Tioli Storage Manager Version xiii New for the serer in Version xiii Node replication xiii Deduplication of NetApp file-serer data... xiii Database table and index reorganization... xi Automatic backup-archie client deployment xi Multistream database backup and restore processing xi Tioli Monitoring for Tioli Storage Manager updates xi Estimation of processor alue units..... x Prerequisite checker x Storage deice updates xi Administration Center updates xii Serer session disablement and enablement xiii Command-line help for subcommands... xiii Data encryption with SSL xix Chapter 1. Tioli Storage Manager performance tuning oeriew Chapter 2. Tioli Storage Manager serer performance tuning Tuning serer options DBMEMPERCENT EXPINTERVAL MAXSESSIONS MOVEBATCHSIZE and MOVESIZETHRESH.. 4 RESTOREINTERVAL TCPNODELAY TCPWINDOWSIZE TXNGROUPMAX Serer hardware recommendations Database manager for Tioli Storage Manager... 9 Database and log performance Database manager tuning Improing z/os media serer performance Backup performance Tuning the performance of automatic backup-archie client deployment Tuning inentory expiration Remoing olume history files Searching the serer actiity log Client and serer communication using Secure Sockets Layer Scheduling sessions and processes LAN-free backup Maximum number of mount points for a node.. 16 Managing storage pools and olumes Cached disk storage pools Enabling file system cache Tuning storage pool migration Improing storage agent performance Performance improement actiities for serer platforms Actions for better performance on all serer platforms UNIX file systems AIX serer performance AIX: mo commands Linux serer Linux on System z serer Oracle Solaris serer Windows serer Tuning kernel parameters Estimating throughput in untested enironments.. 27 Tuning tape drie performance Using collocation with tape dries Tape drie transfer rate Tuning disk storage performance Configuring the Tioli Storage Manager serer disk enironment Determining the disk system type Disk I/O characteristics Improing serer performance through database configuration Optimizing disk system read-ahead processes.. 33 Determining storage pool olume size Managing file system fragmentation Content Management enironments Busses Chapter 3. Tioli Storage Manager client performance tuning COMMRESTARTDURATION and COMMRESTARTINTERVAL COMPRESSALWAYS COMPRESSION DISKBUFFSIZE MEMORYEFFICIENTBACKUP QUIET RESOURCEUTILIZATION TAPEPROMPT TCPBUFFSIZE TCPNODELAY TCPWINDOWSIZE TXNBYTELIMIT Multiple session backup and restore Copyright IBM Corp. 1996, 2011 iii

6 Analyzing performance data for client backup and restore Client command line options Performance recommendations by client platform. 48 Macintosh client Windows client Client performance recommendations for all platforms Hierarchical Storage Manager tuning Chapter 4. Administration Center performance tuning Administration Center capacity planning Maximum number of actie administrators Processing capacity I/O throughput Processing memory Jaa heap memory size Administration Center setup recommendations.. 54 Installation requirements Locating the Administration Center Minimizing memory usage Optimizing Windows Serer 2003 memory Using the default action Tuning Administration Center performance Tuning processor performance Tuning network performance Tuning memory performance Resoling Administration Center performance tuning issues Sizing the number of Tioli Storage Manager Administration Center installations Optimizing the performance of the Administration Center Modifying the IBM Tioli Monitoring enironment file for performance Chapter 5. Network protocol tuning.. 61 TCP/IP communication concepts and tuning Sliding window Networks Limiting network traffic AIX network settings MTU and MSS settings Oracle Solaris network settings z/os network settings USS client with IBM TCP/IP for z/os TCP/IP and z/os UNIX system serices performance tuning Appendix. Accessibility features for the Tioli Storage Manager product family. 71 Notices Trademarks Glossary Index i IBM Tioli Storage Manager: Performance Tuning Guide

7 Preface Who should read this guide Publications This publication helps you tune the performance of the serers and clients in your IBM Tioli Storage Manager enironment. Before using this publication, you should be familiar with the following areas: The operating systems on which your IBM Tioli Storage Manager serers and clients reside The communication protocols installed on your client and serer machines The audience for this publication is anyone who wants to improe the performance of the Tioli Storage Manager serer and client, and the network and attached hardware as they apply to Tioli Storage Manager. IBM Tioli Storage Manager publications, Tioli Storage FlashCopy Manager publications, and other related publications are aailable online. You can search all publications in the Tioli Storage Manager Information Center: You can download PDF ersions of publications from the Tioli Storage Manager Information Center or from the IBM Publications Center at shop/publications/order/. Go to Tioli Documentation Central to find information centers that contain official product documentation for current and preious ersions of Tioli products, including Tioli Storage Manager products at deeloperworks/wikis/display/tiolidoccentral/tioli+storage+manager. You can also order some related publications from the IBM Publications Center website. The website proides information about ordering publications from countries other than the United States. In the United States, you can order publications by calling Tioli Storage Manager publications The following tables list the publications that make up the Tioli Storage Manager library. Table 1. Tioli Storage Manager serer publications Publication title IBM Tioli Storage Manager for AIX Installation Guide IBM Tioli Storage Manager for AIX Administrator's Guide IBM Tioli Storage Manager for AIX Administrator's Reference IBM Tioli Storage Manager for HP-UX Installation Guide Order number GC SC SC GC Copyright IBM Corp. 1996, 2011

8 Table 1. Tioli Storage Manager serer publications (continued) Publication title IBM Tioli Storage Manager for HP-UX Administrator's Guide IBM Tioli Storage Manager for HP-UX Administrator's Reference IBM Tioli Storage Manager for Linux Installation Guide IBM Tioli Storage Manager for Linux Administrator's Guide IBM Tioli Storage Manager for Linux Administrator's Reference IBM Tioli Storage Manager for Oracle Solaris Installation Guide IBM Tioli Storage Manager for Oracle Solaris Administrator's Guide IBM Tioli Storage Manager for Oracle Solaris Administrator's Reference IBM Tioli Storage Manager for Windows Installation Guide IBM Tioli Storage Manager for Windows Administrator's Guide IBM Tioli Storage Manager for Windows Administrator's Reference IBM Tioli Storage Manager for z/os Media Installation and User's Guide IBM Tioli Storage Manager Upgrade and Migration Guide for V5 Serers IBM Tioli Storage Manager Integration Guide for Tioli Storage Manager FastBack Order number SC SC GC SC SC GC SC SC GC SC SC SC GC SC Table 2. Tioli Storage Manager storage agent publications Publication title IBM Tioli Storage Manager for SAN for AIX Storage Agent User's Guide IBM Tioli Storage Manager for SAN for HP-UX Storage Agent User's Guide IBM Tioli Storage Manager for SAN for Linux Storage Agent User's Guide IBM Tioli Storage Manager for SAN for Oracle Solaris Storage Agent User's Guide IBM Tioli Storage Manager for SAN for Windows Storage Agent User's Guide Order number SC SC SC SC SC Table 3. Tioli Storage Manager client publications Publication title IBM Tioli Storage Manager for UNIX and Linux: Backup-Archie Clients Installation and User's Guide IBM Tioli Storage Manager for Windows: Backup-Archie Clients Installation and User's Guide IBM Tioli Storage Manager Using the Application Programming Interface IBM Tioli Storage Manager for Space Management for UNIX and Linux: User s Guide IBM Tioli Storage Manager HSM for Windows Administration Guide Order number SC SC SC SC SC i IBM Tioli Storage Manager: Performance Tuning Guide

9 Table 4. Tioli Storage Manager data protection publications Publication title IBM Tioli Storage Manager for Databases: Data Protection for Microsoft SQL Serer Installation and User s Guide IBM Tioli Storage Manager for Databases: Data Protection for Oracle for UNIX and Linux Installation and User s Guide IBM Tioli Storage Manager for Databases: Data Protection for Oracle for Windows Installation and User s Guide IBM Tioli Storage Manager for Mail: Data Protection for Microsoft Exchange Serer Installation and User s Guide IBM Tioli Storage Manager for Mail: Data Protection for Lotus Domino UNIX and Linux Installation and User s Guide IBM Tioli Storage Manager for Mail: Data Protection for Lotus Domino for Windows Installation and User s Guide IBM Tioli Storage Manager for Enterprise Resource Planning: Data Protection for SAP Installation and User s Guide for DB2 IBM Tioli Storage Manager for Enterprise Resource Planning: Data Protection for SAP Installation and User s Guide for Oracle IBM Tioli Storage Manager for Virtual Enironments Installation and User s Guide IBM Tioli Storage Manager for Microsoft SharePoint Guide Order number GC SC SC GC SC SC SC SC SC N/A Table 5. IBM Tioli Storage Manager troubleshooting and tuning publications Publication title Order number IBM Tioli Storage Manager Problem Determination Guide GC IBM Tioli Storage Manager Performance Tuning Guide GC IBM Tioli Storage Manager Client Messages and Application SC Programming Interface Return Codes IBM Tioli Storage Manager Serer Messages and Error Codes SC IBM Tioli Storage Manager for Mail: Data Protection for Microsoft GC Exchange Serer Messages IBM Tioli Storage Manager for Databases: Data Protection for Microsoft GC SQL Serer Messages IBM Tioli Storage Manager for Databases: Data Protection for Oracle SC Messages IBM Tioli Storage Manager for Mail: Data Protection for Lotus Domino SC Messages IBM Tioli Storage Manager for Enterprise Resource Planning: Data SC Protection for SAP Messages Note: You can find information about IBM System Storage Archie Manager at c_complydataretention_or.html. Preface ii

10 Tioli Storage FlashCopy Manager publications The following table lists the publications that make up the Tioli Storage FlashCopy Manager library. Table 6. Tioli Storage FlashCopy Manager publications Publication title IBM Tioli Storage FlashCopy Manager for UNIX and Linux Installation and User s Guide IBM Tioli Storage FlashCopy Manager for Windows Installation and User s Guide IBM Tioli Storage FlashCopy Manager for VMware Installation and User s Guide IBM Tioli Storage FlashCopy Manager Messages Order number SC SC SC GC Support information You can find support information for IBM products from arious sources. Start at the IBM Support Portal: You can select the products that you are interested in and search for a wide ariety of releant information. Getting technical training Information about Tioli technical training courses is aailable online. Go to the following websites to sign up for training, ask questions, and interact with others who use IBM storage products. Tioli software training and certification Choose from instructor led, online classroom training, self-paced Web classes, Tioli certification preparation, and other training options at Tioli Support Technical Exchange Technical experts share their knowledge and answer your questions in webcasts at supp_tech_exch.html. Storage Management community Interact with others who use IBM storage management products at index.html Global Tioli User Community Share information and learn from other Tioli users throughout the world at IBM Education Assistant View short "how to" recordings designed to help you use IBM software products more effectiely at ieduasst/ti1r0/index.jsp iii IBM Tioli Storage Manager: Performance Tuning Guide

11 Searching knowledge bases If you hae a problem with your Tioli Storage Manager family product, there are seeral knowledge bases that you can search. Begin by searching the Tioli Storage Manager Information Center at From this website, you can search the current Tioli Storage Manager documentation. Searching the Internet If you cannot find an answer to your question in the IBM Tioli Storage Manager information center, search the Internet for the information that might help you resole your problem. To search multiple Internet resources, go to the IBM support website at You can search for information without signing in. Sign in using your IBM ID and password if you want to customize the site based on your product usage and information needs. If you do not already hae an IBM ID and password, click Sign in at the top of the page and follow the instructions to register. From the support website, you can search arious resources including: IBM technotes IBM downloads IBM Redbooks publications IBM Authorized Program Analysis Reports (APARs) Select the product and click Downloads to search the APAR list. If you still cannot find a solution to the problem, you can search forums and newsgroups on the Internet for the latest information that might help you find problem resolution. An independent user discussion list, ADSM-L, is hosted by Marist College. You can subscribe by sending an to listser@m.marist.edu. The body of the message must contain the following text: SUBSCRIBE ADSM-L your_first_name your_family_name. To share your experiences and learn from others in the Tioli Storage Manager and Tioli Storage FlashCopy Manager user communities, go to the following wikis: Tioli Storage Manager wiki tiolistoragemanager Tioli Storage FlashCopy Manager wiki wiki/tioli Storage FlashCopy Manager Preface ix

12 Using IBM Support Assistant IBM Support Assistant is a complimentary software product that can help you with problem determination. It is aailable for some Tioli Storage Manager and Tioli Storage FlashCopy Manager products. To learn about which products are supported, go to the IBM Support Assistant download web page at download.html. IBM Support Assistant helps you gather support information when you must open a problem management record (PMR), which you can then use to track the problem. The product-specific plug-in modules proide you with the following resources: Support links Education links Ability to submit problem management reports You can find more information at the IBM Support Assistant website: You can also install the stand-alone IBM Support Assistant application on any workstation. You can then enhance the application by installing product-specific plug-in modules for the IBM products that you use. Find add-ons for specific products at Finding product fixes A product fix to resole your problem might be aailable from the IBM software support website. You can determine what fixes are aailable by checking the IBM software support website at If you preiously customized the site based on your product usage: 1. Click the link for your product, or a component for which you want to find a fix. 2. Click Downloads, and then click Fixes by ersion. If you hae not customized the site based on your product usage, click Downloads and search for your product. Receiing notification of product fixes You can receie notifications about fixes, flashes, upgrades, and other news about IBM products. To sign up to receie notifications about IBM products, follow these steps: 1. From the support page at click Sign in to create, manage, or iew your subscriptions in the Notifications pane. 2. Sign in using your IBM ID and password. If you do not hae an ID and password, click register now and complete the registration process. 3. Click Manage all my subscriptions in the Notifications pane. 4. Click the Subscribe tab and then click Tioli. 5. Select the products for which you want to receie notifications and click Continue. x IBM Tioli Storage Manager: Performance Tuning Guide

13 6. Specify your notification preferences and click Submit. Contacting IBM Software Support You can contact IBM Software Support if you hae an actie IBM subscription and support contract and if you are authorized to submit problems to IBM. To obtain help from IBM Software Support, complete the following steps: 1. Ensure that you hae completed the following prerequisites: a. Set up a subscription and support contract. b. Determine the business impact of your problem. c. Describe your problem and gather background information. 2. Follow the instructions in Submitting the problem to IBM Software Support on page xii. Setting up a subscription and support contract Set up a subscription and support contract. The type of contract that you need depends on the type of product you hae. For IBM distributed software products (including, but not limited to, IBM Tioli, Lotus, and Rational products, as well as IBM DB2 and IBM WebSphere products that run on Microsoft Windows or on operating systems such as AIX or Linux), enroll in IBM Passport Adantage in one of the following ways: Online: Go to the Passport Adantage website at software/lotus/passportadantage/, click How to enroll, and follow the instructions. By telephone: You can call IBMSERV ( ) in the United States. For the telephone number to call in your country, go to the IBM Software Support Handbook web page at set2/sas/f/handbook/home.html and click Contacts. Determining the business impact When you report a problem to IBM, you are asked to supply a seerity leel. Therefore, you must understand and assess the business impact of the problem you are reporting. Seerity 1 Seerity 2 Seerity 3 Seerity 4 Critical business impact: You are unable to use the program, resulting in a critical impact on operations. This condition requires an immediate solution. Significant business impact: The program is usable but is seerely limited. Some business impact: The program is usable with less significant features (not critical to operations) unaailable. Minimal business impact: The problem causes little impact on operations, or a reasonable circumention to the problem has been implemented. Preface xi

14 Describing the problem and gathering background information When explaining a problem to IBM, it is helpful to be as specific as possible. Include all releant background information so that IBM Software Support specialists can help you sole the problem efficiently. To sae time, know the answers to these questions: What software ersions were you running when the problem occurred? Do you hae logs, traces, and messages that are related to the problem symptoms? IBM Software Support is likely to ask for this information. Can the problem be re-created? If so, what steps led to the failure? Hae any changes been made to the system? For example, hardware, operating system, networking software, and so on. Are you using a workaround for this problem? If so, be prepared to explain it when you report the problem. Submitting the problem to IBM Software Support You can submit the problem to IBM Software Support online or by telephone. Online Go to the IBM Software Support website at support/entry/portal/open_serice_request/software/ Software_support_(general). Sign in to access IBM Serice Requests and enter your information into the problem submission tool. By telephone For the telephone number to call in your country, go to the IBM Software Support Handbook at f/handbook/home.html and click Contacts. xii IBM Tioli Storage Manager: Performance Tuning Guide

15 New for IBM Tioli Storage Manager Version 6.3 Many features in the Tioli Storage Manager Version 6.3 serer are new for preious Tioli Storage Manager users. New for the serer in Version 6.3 Read about new features and other changes in Tioli Storage Manager V6.3 serer. Technical updates since the preious edition are marked with a ertical bar ()in the left margin. Node replication Node replication is the process of incrementally copying or replicating client node data from one serer of Tioli Storage Manager to another serer of Tioli Storage Manager for the purpose of disaster recoery. The serer from which client node data is replicated is called a source replication serer. The serer to which client node data is replicated is called a target replication serer. Node replication aoids the logistics and security exposure of physically moing tape media to a remote location. If a disaster occurs and the source replication serer is unaailable, backup-archie clients of Tioli Storage Manager can recoer their data from the target replication serer. If you cannot recoer the source replication serer, you can conert client nodes to nonreplicating nodes for store operations on the target replication serer. If you use the export and import functions of Tioli Storage Manager to store client node data on a disaster-recoery serer, you can conert the nodes to replicating nodes. When replicating data, you can also use data deduplication to reduce bandwidth and storage requirements. Tioli Storage Manager V6.3 serers can be used for node replication. Howeer, you can replicate data for client nodes that are at V6.3 or earlier. You can also replicate data that was stored on a Tioli Storage Manager V6.2 or earlier serer before you upgraded it to V6.3. Deduplication of NetApp file-serer data Deduplication of data that belongs to network-attached storage (NAS) file-serers is disabled by default. To enable deduplicaton of NetApp file-serer data, use the new ENABLENASDEDUP serer option. Copyright IBM Corp. 1996, 2011 xiii

16 Database table and index reorganization If automatic table and index reorganization is affecting serer performance, you can manually schedule reorganizations. Automatic backup-archie client deployment Tioli Storage Manager, Version 6.3 can be scheduled to automatically deploy backup-archie client software to all workstations that hae the backup-archie client installed. You can deploy backup-archie clients on Microsoft Windows operating systems from a fix pack or interim fixes for all releases at V5.4 or later. You can migrate the Backup-Archie Client to a newer ersion, release, modification, or fix pack leel that is V5.5 and later. You can deploy backup-archie clients on operating systems other than Windows from all releases at V5.5 or later. These Backup-Archie Clients can go to any later ersion, release, modification, or fix leel. You can coordinate the updates to each Backup-Archie Client from the Administration Center. Multistream database backup and restore processing Multiple, concurrent data streams can reduce the amount of time that is required to back up or restore the database. You can specify multiple, concurrent data streams for automatic or manual database-backup operations. During restore operations, the Tioli Storage Manager serer attempts to use the same number of data streams that you specified for the backup operation. For example, suppose that you specify four data streams for a database backup operation. During a restore operation, the serer attempts to use four dries. If one drie is offline and unaailable, the serer uses three dries for the restore operation. The benefit of multiple, concurrent data streaming depends on the size of the database. In general, if the database is less than 150 GB, the amount of time that you can sae is relatiely small. Multiple, concurrent data streaming also uses more olumes. If the olumes are high-capacity and if you use data compression, the result can be wasted space. Tioli Monitoring for Tioli Storage Manager updates IBM Tioli Monitoring for Tioli Storage Manager, preiously referred to as the Reporting and Monitoring feature, has an improed installation wizard. Cognos is now included for custom report creation. Updates to Tioli Monitoring for Tioli Storage Manager include the following items: Cognos Business Intelligence V8 is an integrated business intelligence suite that is proided as part of Tioli Common Reporting. Tioli Common Reporting is included in the Administration Center installation when you select the Tioli Common Reporting component. See Customizing reports with Cognos Business Intelligence, in the Monitoring operations section of the Administrator's Guide for details. All of the information regarding client and serer reports can also be found in that section. The installation process has been improed to include a prerequisite checker, and now performs all installation configuration tasks automatically. xi IBM Tioli Storage Manager: Performance Tuning Guide

17 A customizable dashboard workspace has been added to display many commonly iewed items in a single iew. With the default setting, the dashboard displays data about the storage space used by node; unsuccessful client and serer schedules; and details about storage pools, dries, and actiity log error messages. You can include multiple serers in a single report. Reports hae been enhanced to refine the accuracy of the data being displayed. New Tioli Enterprise Portal workspaces are: actiity log, agent log, updates to client node status, dries, libraries, occupancy, PVU details, and replication status and details. New client reports are aailable: storage pool media details, storage summary details, replication details, replication growth, and replication summary. New serer reports are aailable: actiity log details, serer throughput, and an updated serer throughput report for data collected by agents earlier than ersion 6.3. Estimation of processor alue units You can use new methods to obtain information about the number of client and serer deices connected to the system, and the utilization of processor alue units (PVUs) by serer deices. The new methods proide information to help you assess the license compliance of the Tioli Storage Manager system. By using the new QUERY PVUESTIMATE command, you can generate reports that estimate the number of serer deices and client deices managed by the Tioli Storage Manager serer. You can also iew PVU information on a per-node basis. These reports are not legally binding, but proide a starting point for determining license requirements. Alternatiely, you can iew PVU information in the Administration Center. The Administration Center proides summaries of client deices, serer deices, and estimated PVUs, and more detailed information. For purposes of PVU estimation, only nodes on Windows 7, Windows XP Professional, and Apple systems are classified as client deices by default. Nodes on all other platforms are classified as serer deices by default. You can update the role classification by issuing the UPDATE NODE command. You can also iew and change the role classifications in the Administration Center client node notebook. For a detailed report, issue the SQL SELECT * FROM PVUESTIMATE_DETAILS command. This command extracts information at the node leel. This data can be exported to a spreadsheet and modified to more accurately represent the system enironment. Prerequisite checker Tioli Storage Manager Version 6.3 includes a prerequisite checker, a tool that can be run before starting the Tioli Storage Manager installation. The prerequisite checker erifies requirements for the Tioli Storage Manager serer, the Administration Center, and Tioli Monitoring for Tioli Storage Manager. The prerequisite checker erifies the operating system, the amount of free disk space, the required memory for the serer, and other prerequisites. The tool presents a summary of results, informs you about changes that are required in your enironment before installation, and creates required directories. In this way, the prerequisite checker can help to simplify the installation process. New for IBM Tioli Storage Manager Version 6.3 x

18 Storage deice updates New deice support and other changes to storage deices are aailable in Tioli Storage Manager Version 6.3. Virtual tape libraries With enhancements aailable in Version 6.3, you can define a library as a irtual tape library (VTL) to Tioli Storage Manager. VTLs primarily use disk subsystems to internally store data. Because they do not use tape media, you can exceed the capabilities of a physical tape library when using VTL storage. Using a VTL, you can define many olumes and dries which proides for greater flexibility in the storage enironment and increases productiity by allowing more simultaneous mounts and tape I/O. Faster formatting of DISK and preallocated FILE olumes AIX HP-UX Linux Solaris On some Linux and UNIX file systems, including ext4 on Linux and JFS2 on AIX, Tioli Storage Manager formats random-access olumes and preallocated sequential-access disk olumes nearly instantaneously. For example, Tioli Storage Manager can format a FILE or DISK olume on JFS2 in less than one second. The new method for formatting olumes on some Linux and UNIX systems is similar to the method that Tioli Storage Manager has been using to format olumes on Windows operating systems. The new method proides the following adantages: During olume formatting, I/O is negligible and does not affect performance. For example, if you are running a serer operation and you require an additional olume, you can format the olume without affecting the performance of the current operation. File system storage is allocated for the full file size without writing blocks and without creating sparse files. For example, if you issue the DEFINE VOLUME command to create a 10 GB olume, the underlying file in the file system consumes 10 GB of storage. Because the FILE olume size does not change, file-system log files do not require constant updating. The possibility for file fragmentation is minimized. Before using the new olume formatting method, Tioli Storage Manager checks the file system to determine whether the file system supports the method. If the file system does not, Tioli Storage Manager uses the old method. Access to storage deices attached by FICON on a z/os system The database of a Tioli Storage Manager V5 serer running on a z/os system can be migrated to a V6.3 serer running on AIX or Linux on System z. After the upgrade, z/os users can continue to access data stored on tape olumes whose contents are accessed by using FICON attached storage deices. The Tioli Storage Manager V6.3 serer accesses client data by using a storage deice attached to z/os. The storage deice is made aailable by IBM Tioli Storage Manager for z/os Media. In addition, Tioli Storage Manager for z/os Media facilitates access to Virtual Storage Access Method (VSAM) linear data sets on z/os by using an enhanced sequential FILE storage method. xi IBM Tioli Storage Manager: Performance Tuning Guide

19 Append-only mode for IBM LTO-5 dries The CHECKTAPEPOS serer option allows the Tioli Storage Manager serer to check the alidity and consistency of data block positions on tape. Enhancements to this option enable a drie to check for data oerwrite problems before each WRITE operation and allow Tioli Storage Manager to reposition tapes to the correct location and continue to write data. Use the CHECKTAPEPOS option with IBM LTO Generation 5 dries. Persistent resere for tape dries Persistent reseration allows tape drie reserations from other serers to be cleared, if, for example, a serer crashes. In Tioli Storage Manager Version 6.3, persistent resere is enabled for dries and drier leels that support the feature. For additional details on persistent resere support, see Technote at Administration Center updates New Administration Center support is aailable in Tioli Storage Manager Version 6.3. Tioli Integrated Portal, Version 2.1 AIX Linux Solaris Windows The Tioli Storage Manager Administration Center uses Tioli Integrated Portal for its graphical user interface (GUI). With Tioli Integrated Portal V2.1, you can now monitor the Administration Center with Internet Explorer 8 and Mozilla Firefox 3.5. All browsers that you used with Tioli Integrated Portal V1.1.1 and later can be used with this latest ersion. When you install Tioli Integrated Portal V2.1 installing Tioli Common Reporting, embedded security serice, or the time scheduling serice is optional. These features can be added and registered with Tioli Integrated Portal V2.1 at a later time. Administration Center policy domain updates With enhancements to the Administration Center, you can now specify serer eent-based archie settings using the Policy Domain and Management Class wizards. If you set an archie retention period for an object through the serer, you can update these settings using the Administration Center Management Class notebook. Setting an archie retention period ensures that objects are not deleted from the Tioli Storage Manager serer until policy-based retention requirements for that object are satisfied. New for IBM Tioli Storage Manager Version 6.3 xii

20 Analysis of client performance data With the new client performance monitor function, you hae the capability to gather and analyze performance data about backup and restore operations for an IBM Tioli Storage Manager client. The client performance monitor function is accessed from the Tioli Storage Manager Administration Center and uses data that is collected by the API. You can iew performance information about processor, disk, and network utilization, and performance data that relates to data transfer rates and data compression. You can analyze data throughput rates at any time during a backup or restore operation. Also, you can use the performance information to analyze processor, disk, or network performance bottlenecks. Serer session disablement and enablement You can now temporarily disable and enable all outbound or inbound sessions for a particular Tioli Storage Manager serer. This feature is useful, for example, if you hae a planned network outage that might affect communication between a source and a target replication serer. To preent replication failures, you can disable outbound sessions from the source replication serer before the outage. After communications hae been reestablished, you can resume replication by enabling outbound sessions. Command-line help for subcommands In this release, you can obtain help for Tioli Storage Manager subcommands. For example, you can display help for the DEFINE DEVCLASS command for 3570 deice classes and for 3590 deice classes. To display command-line help for a subcommand, type help followed by the topic number for the command. Topic numbers are listed in the table of contents, for example: 3.0 Administratie commands DEFINE DEVCLASS (Define a deice class) DEFINE DEVCLASS (Define a 3570 deice class) DEFINE DEVCLASS (Define a 3590 deice class)... To display help for the DEFINE DEVCLASS command for 3570 deice classes, type: help As in preious releases, you can use this method to display help for commands that hae unique names, such as REGISTER NODE: 3.46 REGISTER REGISTER ADMIN (Register an administrator) REGISTER LICENSE (Register a new license) REGISTER NODE (Register a node) To display help for the REGISTER NODE command, you can type: help You can also type help commandname, where commandname is the name of the serer command for which you want information: help register node xiii IBM Tioli Storage Manager: Performance Tuning Guide

21 Data encryption with SSL You can use Secure Sockets Layer (SSL) on HP-UX, Linux, Solaris, AIX, and Windows platforms. With SSL industry-standard communications, you can encrypt all traffic between the backup-archie client, the administratie command-line clients, and the Tioli Storage Manager serer. You can use either self-signed or endor-acquired SSL certificates. Serer self-signed certificates that were created in releases before Tioli Storage Manager V6.3 for SSL sessions are not compatible with the V6.3 client. To use SSL with self-signed certificates, use the SSLTLS12 option after distributing a new self-signed certificate to all V6.3 clients. New for IBM Tioli Storage Manager Version 6.3 xix

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23 Chapter 1. Tioli Storage Manager performance tuning oeriew Tioli Storage Manager performance can be influenced by arious factors. Tuning for optimal performance requires care and expertise. Tuning IBM Tioli Storage Manager can be complex because of the many operating systems, network configurations, and storage deices that Tioli Storage Manager supports. Performance tuning een for a single platform function is complex. The factors that can affect performance and hae significant effects include: Aerage client file size Percentage of files changed since last incremental backup Percentage of bytes changed since last incremental backup Serer hardware (CPUs, RAM, disk dries, network adapters) Serer storage pool deices (disk, tape, optical) Serer operating system Serer actiity (non-tioli Storage Manager workload) Client hardware (CPUs, RAM, disk dries, network adapters) Client operating system Client actiity (non-tioli Storage Manager workload) Network hardware and configuration Network utilization Network reliability Communication protocols Communication protocol tuning Final output repository type (disk, tape, optical) Copyright IBM Corp. 1996,

24 2 IBM Tioli Storage Manager: Performance Tuning Guide

25 Chapter 2. Tioli Storage Manager serer performance tuning Tuning serer options You can tune the performance of IBM Tioli Storage Manager serers through serer options, commands, and other configuration settings. The options are tunable on all Tioli Storage Manager serers. You can change option settings in the serer options file (dsmser.opt). If you change the serer options file, you must stop and restart the serer for the changes to take effect. You can also change some settings with the serer SETOPT command. Some serer options can be tuned to improe IBM Tioli Storage Manager performance. The following options are tunable on all Tioli Storage Manager serers. You can change any option setting in serer options file (dsmser.opt). You can change some options with the serer SETOPT command. If you change the serer options file, you must halt and restart the serer for the changes to take effect. DBMEMPERCENT The DBMEMPERCENT serer option sets a limit on the percentage of the system memory that is used for the database manager. By default, the percentage of irtual address space that is dedicated to database manager processes is set to 70 to 80% of system RAM. To change this setting to a alue from 10 to 99%, modify the DBMEMPERCENT serer option. Ensure that the alue allows adequate memory for both the IBM Tioli Storage Manager serer and any other applications that are running on the system. The default alue is AUTO. It is generally not necessary to change this setting on a system that is dedicated to a single Tioli Storage Manager serer. If there are other applications that require significant amounts of memory on a system, changing this setting to an appropriate amount might reduce paging. For systems with multiple Tioli Storage Manager serers, changing this setting for each serer is recommended. For example, the percentage of irtual address space could be set to 25% for each of three serers on a system. Each serer could also hae a different alue for this setting, as appropriate for the workload on that serer. EXPINTERVAL Inentory expiration remoes client backup and archie file copies from the serer. The EXPINTERVAL serer option specifies the interal, in hours, between automatic inentory expirations run by the Tioli Storage Manager serer. The default is 24. Backup and archie copy groups can specify the criteria that make copies of files eligible for deletion from data storage. Howeer, een when a file becomes eligible for deletion, the file is not deleted until expiration processing occurs. If expiration processing does not occur periodically, storage pool space is not reclaimed from expired client files, and the Tioli Storage Manager serer requires increased disk storage space. Copyright IBM Corp. 1996,

26 Expiration processing is CPU and database input/output (I/O) intensie. If possible, it should be run when other Tioli Storage Manager processes are not occurring. To enable this, set EXPINTERVAL to 0 and either schedule expiration to occur once each day, or manually start the process with the EXPIRE INVENTORY serer command. Expiration processing can be scheduled by defining an administratie schedule. When using the DURATION parameter on an administratie schedule, periodically check that expiration is actually completing within the specified time. This is the recommended setting: EXPINTERVAL 0 This setting specifies that there is no expiration processing. Use an administratie schedule to run expiration at an appropriate time each day. MAXSESSIONS The MAXSESSIONS serer option specifies the maximum number of simultaneous client sessions that can connect with the Tioli Storage Manager serer. The default alue is 25 client sessions. The minimum alue is 2 client sessions. The maximum alue is limited only by aailable irtual memory or communication resources. By limiting the number of clients, serer performance can be improed, but the aailability of Tioli Storage Manager serices to the clients is reduced. A typical production Tioli Storage Manager serer could hae the MAXSESSIONS parameter set to 100 or greater. MOVEBATCHSIZE and MOVESIZETHRESH The MOVEBATCHSIZE and MOVESIZETHRESH serer options tune the performance of serer processes that inole the moement of data between storage media. These processes include storage pool backup and restore, migration, reclamation, and moe data operations. MOVEBATCHSIZE specifies the number of files to be moed and grouped in a batch, within the same serer transaction. The default alue for MOVEBATCHSIZE is 1000; and the maximum alue is also The MOVESIZETHRESH option specifies, in megabytes, a threshold for the amount of data moed as a batch, within the same serer transaction. When this threshold is reached, no more files are added to the current batch, and a new transaction is started after the current batch is moed. The default alue for MOVESIZETHRESH is 4096; and the maximum alue is The number of client files moed for each serer database transaction are determined by the number and size of the files in the batch. Database transactions can be a serer storage pool backup/restore, migration, reclamation, or moe data operation. If the number of files in the batch equals the MOVEBATCHSIZE before the cumulatie size of the files becomes greater than the MOVESIZETHRESH, then the MOVEBATCHSIZE is used to determine the number of files moed or copied in the transaction. If the cumulatie size of files being gathered for a moe or copy operation exceeds the MOVESIZETHRESH alue before the number of files becomes equialent to the MOVEBATCHSIZE, then the MOVESIZETHRESH alue is used to determine the number of files moed or copied in the transaction. Using alues higher than the default can improe performance of serer data moement operations, such as storage pool migration or backup storage pool, to 4 IBM Tioli Storage Manager: Performance Tuning Guide

27 real tape deices. Virtual tape deices and disk only configurations tend to not benefit from larger alues than the default. When the MOVEBATCHSIZE or MOVESIZETHRESH parameters are increased from their default alues, the serer requires more space in the actie log. The actie log might require an allocation of space two or more times larger than a actie log size which uses the defaults. In addition, the serer requires a longer initialization time at startup. If you choose to increase these alues for performance reasons, be sure to monitor actie log usage during the first few storage pool backup, restore, migration, reclamation, or moe data operations to ensure sufficient actie log space is aailable. The following are the recommended settings: MOVEBATCHSIZE 1000 MOVESIZETHRESH RESTOREINTERVAL The RESTOREINTERVAL option specifies how long, in minutes, that a restartable restore session can be in the database before it can be expired. Restartable restores allow restores to continue after an interruption without starting at the beginning. Restartable restores reduce duplicate effort or manual determination of where a restore process was terminated. The RESTOREINTERVAL option defines the amount of time an interrupted restore can remain in the restartable state. The minimum alue is 0. The maximum is (one week). The default is 1440 (24 hours). If the alue is set to 0 and the restore is interrupted or fails, the restore is still put in the restartable state. Howeer, it is immediately eligible to be expired. Restartable restore sessions consume resources on the Tioli Storage Manager serer. You should not keep these sessions any longer than they are needed. It is recommended that you tune the RESTOREINTERVAL option to your enironment. TCPNODELAY The TCPNODELAY serer option specifies whether the serer allows data packets that are less than the maximum transmission unit (MTU) size to be sent out immediately oer the network. When TCPNODELAY is set to NO, the serer buffers data packets that are less than the MTU size: Buffering can improe network utilization. Buffering requires a delay that can impact session throughput greatly. When set to YES, it disables the TCP/IP Nagle algorithm, which allows data packets less than the MTU size to be sent out immediately. Setting this option to YES might improe performance in higher speed networks. The default is YES. The following is the recommended setting: TCPNODELAY YES Note: This option also exists on the Tioli Storage Manager client. Chapter 2. Tioli Storage Manager serer performance tuning 5

28 TCPWINDOWSIZE The TCPWINDOWSIZE serer option specifies the amount of data receied, in kilobytes, that can be on a TCP/IP connection at one time. The sending host cannot send more data until an acknowledgment and TCP receie window update are receied. Each TCP packet contains the adertised TCP receie window on the connection. A larger window lets the sender continue to send data and might improe communication performance, especially on fast networks with high latency. The TCPWINDOWSIZE option oerrides the operating system's TCP receie window size. In AIX, for instance, these parameters are tcp_sendspace and tcp_recspace and are set as no options. For Tioli Storage Manager, the default is 63 KB, and the maximum is 2048 KB. Specifying TCPWINDOWSIZE 0 causes Tioli Storage Manager to use the operating system default. Using the default is not preferred for operating systems that use a static alue and do not autotune. The reason for that is because the optimal setting for Tioli Storage Manager might not be the same as the optimal setting for other applications. You might need more kernel memory if you set a large TCP receie window size. If Tioli Storage Manager clients and serer are on the same subnet, a larger TCP receie window size is unlikely to improe throughput. The risk of the increased memory requirements might oershadow the benefit. Newer operating systems proide TCP/IP stacks that commit the requested memory as needed. Therefore they hae a lower risk of increased kernel memory for the send and receie buffers. These newer operating systems can also auto-tune the receie buffer size by obsering the session transfer statistics, either increasing or decreasing the receie window as appropriate. For these operating systems only, you might set the Tioli Storage Manager serer TCPWINDOWSIZE option to 0 and use the autotuning feature. These settings are especially useful when there are remote Tioli Storage Manager clients connected to this Tioli Storage Manager serer. For all platforms, TCP receie window scaling, also known as RFC 1323, must be set to use window sizes larger than bytes: AIX AIX: no -o rfc1323=1 HP-UX HP-UX: Using a window size greater than 64 KB-1 automatically enables large window support. Solaris Oracle Solaris 10: Proides TCP window scaling by default. If TCP window scaling is disabled, re-enable it by running the ndd -set /de/tcp tcp_wscale_always 1 command. Linux Linux: Proides TCP window scaling by default. Check to see if TCP window scaling is enabled by running the cat /proc/sys/net/ip4/ tcp_window_scaling command. Windows Windows 2008: Proides TCP window scaling by default. Windows Windows XP Professional and Windows 2003: With regedit, add or modify the following registry name/alue pair under [HKEY_LOCAL_MACHINE\ SYSTEM\CurrentControlSet\Serices\Tcpip\Parameters]: Tcp1323Opts, REG_DWORD, 3 Attention: Before modifying the registry name and alue pair, back up the entire registry. After updating the registry, restart the operating system. 6 IBM Tioli Storage Manager: Performance Tuning Guide