IBM TIVOLI SC32-0129-00 User manual

T ivo l i®Storage Manager for SAN
for AIX
Storage Agent User’s Guide
Version 5.4
SC32-0129-00


T ivo l i®Storage Manager for SAN
for AIX
Storage Agent User’s Guide
Version 5.4
SC32-0129-00


Note!
Before using this information and the product it supports, be sure to read the general information under Appendix C,
“Notices,” on page 53.
Fifth Edition (January 2007)
This edition applies to Version 5.4 of IBM Tivoli Storage Manager for SAN for AIX (program numbers 5608-HSM,
5608-ISM, 5608-ISX, 5608-SAN, and 5608-ARM) and to any subsequent releases until otherwise indicated in new
editions or technical newsletters.
Changes since the December 2004 edition are marked with avertical bar (|) in the left margin. Ensure that you are
using the correct edition for the level of the product.
Order publications through your sales representative or the branch office that serves your locality.
Your feedback is important in helping to provide the most accurate and high-quality information. If you have any
comments about this book or any other IBM Tivoli Storage Manager documentation, please see “Support
Information” on page viii.
©Copyright International Business Machines Corporation 2000, 2007. All rights reserved.
US Government Users Restricted Rights –Use, duplication or disclosure restricted by GSA ADP Schedule Contract
with IBM Corp.
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Contents
About This Book ...........v
How to Use This Book ...........v
Where to Look for Information ........vi
IBM Tivoli Storage Manager Publications ...vi
Tivoli Technical Training......... viii
Support Information .......... viii
Conventions Used in This Guide ......xi
Changes for IBM Tivoli Storage
Manager Version 5......... xiii
Changes for IBM Tivoli Storage Manager Version 5
Release 4—January 2007 ......... xiii
Changes for IBM Tivoli Storage Manager Version 5
Release 3—October 2005 ......... xiii
Changes for IBM Tivoli Storage Manager Version 5
Release 3—December 2004 ........ xiii
Changes for IBM Tivoli Storage Manager Version 5
Release 2—January 2004 .......... xiv
Changes for IBM Tivoli Storage Manager Version 5
Release 2—June 2003 ........... xiv
Chapter 1. Storage Agent Overview ...1
LAN-free Client Data Backup Scenario......3
Multi-session No-Query Restore for LAN-free Path .4
Chapter 2. Planning..........5
Supported Operating Systems ........5
Types of Environments ...........5
ACSLS, SCSI and 349X Tape Library Sharing ..6
File Device Sharing Using Tivoli SANergy ...9
External Libraries............9
System Requirements ...........12
Configuration Information Worksheets .....13
Obtain Device Information ........15
Client Node Information .........15
Chapter 3. Installing and Configuring
Tape-Library and File-Device Sharing
Environments............17
Overview of Installation and Configuration Tasks .17
Step 1. Verifying the Network Connection ....18
Step 2. Establishing Communications among Client,
Storage Agent, and Tivoli Storage Manager ....19
Step 2.1 Client System: Installing Software ...19
Step 2.2 IBM Tivoli Storage Manager Server:
Defining the Storage Agent and Configuring
Devices ...............24
Step 3. Configuring Devices for the Storage Agent to
Access ................26
Tape Devices .............27
Disk Devices .............28
Step 4. (z/OS only) Formatting Volumes for
LAN-free Data Movement .........28
Step 5. Starting the Storage Agent and Verifying the
LAN-free Configuration ..........28
Step 5.1 Start the Storage Agent ......28
Step 5.2 Verify the LAN-free Configuration ...29
Chapter 4. Installing and Configuring
External Library Environments ....31
Overview of Installation and Configuration Tasks .31
Step 1. Verifying the Network Connection ....32
Step 2. Establishing Communications and
Configuring the Client, Storage Agent, and Tivoli
Storage Manager Server ..........32
Step 2.1 Client System: Installing Software ...33
Step 2.2 IBM Tivoli Storage Manager Server:
Defining the Storage Agent and Configuring
Devices ...............37
Step 3. Starting the Storage Agent and Verifying the
LAN-free Configuration ..........40
Step 3.1 Start the Storage Agent ......40
Step 3.2 Verify the LAN-free Configuration ...40
Appendix A. Administration and
Configuration Reference .......43
Starting and Stopping the Storage Agent ....43
Automating the Storage Agent Startup ....43
Manually Starting and Stopping the Storage
Agent ...............43
Adding Communication Information for the Storage
Agent ................44
Format ...............44
Parameters .............44
Examples ..............45
The Storage Agent Options File........46
Required Options ...........46
Additional Options ...........46
The Device Configuration File for the Storage Agent 49
Appendix B. Legacy ACSLS Data
Migration and Coexistence ......51
Data Migration .............51
Appendix C. Notices .........53
Trademarks ..............54
Glossary ..............57
Index ...............61
©Copyright IBM Corp. 2000, 2007 iii
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iv IBM Tivoli Storage Manager for SAN for AIX: Storage Agent User’s Guide

About This Book
This guide is for administrators who install and use the storage agent component
of the IBM®Tivoli®Storage Manager for Storage Area Networks product (referred
to as storage agent throughout this publication). It provides:
vAn overview of LAN-free data transfer
vDetailed explanations for installing, configuring, and using the IBM Tivoli
Storage Manager (Tivoli Storage Manager) client and storage agent, and the
Tivoli Storage Manager server
You should be familiar with Tivoli Storage Manager, storage area network (SAN),
and AIX®operating system administration. If you need additional information
while configuring the storage agent environment, refer to the list of Tivoli Storage
Manager publications in “Where to Look for Information” on page vi.
For information on the Internet about Tivoli Storage Manager, see
www.ibm.com/software/sysmgmt/products/
support/IBMTivoliStorageManager.html.
How to Use This Book
If you have not installed and configured the storage agent before, the following
steps serve as aguide for the information in this book:
1. Confirm the type of environment in which you will be installing and
configuring the storage agent. There are three:
vACSLS, SCSI, and 349X Tape Library sharing
vFile device sharing using software such as Tivoli SANergy®or IBM
TotalStorage SAN File System. For current information about supported
file-sharing software, see www.ibm.com/software/sysmgmt/products/
support/IBMTivoliStorageManager.html.
vExternal library (ACSLS-managed)
See “Types of Environments” on page 5for complete descriptions of the types
of environments.
2. Confirm that your configuration meets the system requirements. These
requirements are listed in “System Requirements” on page 12.
3. Having confirmed the environment and the system requirements, it is
recommended that you gather several pieces of client and server information
that will speed the installation and configuration of the storage agent.
Gather client and server information that will speed the installation and
configuration of the storage agent. Use the two forms in “Configuration
Information Worksheets” on page 13.
4. Finally, depending on the type of configuration you have, you will need to go
to either of two chapters:
vIf you have aACSLS, SCSI, or 349X Tape Library sharing or afile device
sharing configuration, go to Chapter 3, “Installing and Configuring
Tape-Library and File-Device Sharing Environments,” on page 17.
vIf you have an external library configuration, go to Chapter 4, “Installing and
Configuring External Library Environments,” on page 31.
©Copyright IBM Corp. 2000, 2007 v
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Where to Look for Information
The following information describes the service that IBM provides for Tivoli
Storage Manager and tells you where to look for more information about Tivoli
Storage Manager products.
IBM Tivoli Storage Manager Publications
This section lists publications in the IBM Tivoli Storage Manager library and
related documents. It also describes how to access Tivoli publications online and
how to order Tivoli publications.
IBM Tivoli Storage Manager Library
The following documents are available in theTivoli Storage Manager library:
Publication Title Order Number
IBM Tivoli Storage Management Products License Information GH09-4572
IBM Tivoli Storage Manager Messages SC32-0140
IBM Tivoli Storage Manager for AIX Administrator’s Guide SC32-0117
IBM Tivoli Storage Manager for AIX Administrator’s Reference SC32-0123
IBM Tivoli Storage Manager for AIX Installation Guide SC32-0134
IBM Tivoli Storage Manager Basic Concepts Poster SC32-9464
The following table lists Tivoli Storage Manager storage agent publications.
Publication Title Order Number
IBM Tivoli Storage Manager for SAN for AIX Storage Agent User’s
Guide
SC32-0129
IBM Tivoli Storage Manager for SAN for HP-UX Storage Agent User’s
Guide
SC32-0130
IBM Tivoli Storage Manager for SAN for Linux Storage Agent User’s
Guide
SC32-0131
IBM Tivoli Storage Manager for SAN for Sun Solaris Storage Agent
User’s Guide
SC32-0132
IBM Tivoli Storage Manager for SAN for Windows Storage Agent User’s
Guide
SC32-0133
The following table lists Tivoli Storage Manager client publications.
Publication Title Order Number
IBM Tivoli Storage Manager for Space Management for UNIX and Linux:
User’s Guide
SC32-0148
IBM Tivoli Storage Manager for Macintosh: Backup-Archive Clients
Installation and User’s Guide
SC32-0143
IBM Tivoli Storage Manager for NetWare: Backup-Archive Clients
Installation and User’s Guide
SC32-0144
IBM Tivoli Storage Manager for UNIX and Linux: Backup-Archive
Clients Installation and User’s Guide
SC32-0145
IBM Tivoli Storage Manager for Windows: Backup-Archive Clients
Installation and User’s Guide
SC32-0146
vi IBM Tivoli Storage Manager for SAN for AIX: Storage Agent User’s Guide

Publication Title Order Number
IBM Tivoli Storage Manager Using the Application Program Interface SC32-0147
The following table lists publications for application protection products.
Publication Title
Order
Number
IBM Tivoli Storage Manager for Application Servers: Data Protection for
WebSphere Application Server Installation and User’s Guide
SC32-9075
IBM Tivoli Storage Manager for Databases: Data Protection for Microsoft SQL
Server Installation and User’s Guide
SC32-9059
IBM Tivoli Storage Manager for Databases: Data Protection for Oracle for UNIX
and Linux Installation and User’s Guide
SC32-9064
IBM Tivoli Storage Manager for Databases: Data Protection for Oracle for
Windows Installation and User’s Guide
SC32-9065
IBM Tivoli Storage Manager for Databases: Data Protection for Informix
Installation and User’s Guide
SH26-4095
IBM Tivoli Storage Manager for Enterprise Resource Planning: Data Protection for
mySAP Installation and User’s Guide for DB2
SC33-6341
IBM Tivoli Storage Manager for Enterprise Resource Planning: Data Protection for
mySAP Installation and User’s Guide for Oracle
SC33-6340
IBM Tivoli Storage Manager for Hardware: Data Protection for EMC Symmetrix
for R/3 Installation and User’s Guide
SC33-6386
IBM Tivoli Storage Manager for Hardware: Data Protection for Enterprise Storage
Server for DB2 UDB Installation and User’s Guide
SC32-9060
IBM Tivoli Storage Manager for Hardware: Data Protection for FlashCopy Devices
for Oracle Installation and User’s Guide
GC32-1772
IBM Tivoli Storage Manager for Hardware: Data Protection for FlashCopy Devices
for mySAP Installation and User’s Guide for DB2 UDB
SC33-8208
IBM Tivoli Storage Manager for Hardware: Data Protection for FlashCopy Devices
for mySAP Installation and User’s Guide for Oracle
SC33-8207
IBM Tivoli Storage Manager for Mail: Data Protection for Lotus Domino for
UNIX, Linux, and OS/400 Installation and User’s Guide
SC32-9056
IBM Tivoli Storage Manager for Mail: Data Protection for Lotus Domino for
Windows Installation and User’s Guide
SC32-9057
IBM Tivoli Storage Manager for Mail: z/OS Edition Licensed Program
Specifications
GC32-0838
IBM Tivoli Storage Manager for Mail: Data Protection for Microsoft Exchange
Server Installation and User’s Guide
SC32-9058
Related IBM Publications
The following table lists related IBM products publications.
Title Order Number
IBM Magstar 3494 Tape Library Introduction and Planning Guide GA32-0279
IBM 3490E Model E01 and E11 User’s Guide GA32-0298
IBM Magstar MP 3570 Tape Subsystem Operator’s Guide GA32-0345
IBM TotalStorage Tape Device Drivers Installation and User’s Guide GC35-0154
About This Book vii

Title Order Number
IBM TotalStorage Enterprise Tape System 3590 Operator Guide GA32-0330
IBM Magstar 3494 Tape Library Dataserver Operator Guide GA32-0280
IBM TotalStorage Enterprise Tape System 3592 Operator Guide GA32-0465
IBM TotalStorage SAN File System Administrator’s Guide and Reference GA27-4317
IBM Tivoli SANergy Administrator’s Guide GC26-7389
Accessing Publications Online
The product CD contains the publications that are in the product library. The
format of the publications is PDF, HTML, or both. To access the publications using
aWeb browser, open the infocenter.html file. The file is in the appropriate
publications directory on the product CD.
IBM posts publications for this and all other Tivoli products, as they become
available and whenever they are updated, to the Tivoli software information center
Web site. Access the Tivoli software information center by first going to the Tivoli
software library at the following Web address:
http://www.ibm.com/software/tivoli/library/
Scroll down and click the Product manuals link. In the Tivoli Technical Product
Documents Alphabetical Listing window, click the <Tivoli Storage Manager>link
to access the product library at the Tivoli software information center.
Note: If you print PDF documents on other than letter-sized paper, set the option
in the File →Print window that allows Adobe Reader to print letter-sized
pages on your local paper.
Ordering Publications
You can order many Tivoli publications online at the following Web site:
www.elink.ibmlink.ibm.com/public/
applications/publications/cgibin/pbi.cgi
You can also order publications in the United States by calling 800-879-2755.
Tivoli Technical Training
For Tivoli technical training information, refer to the following IBM Tivoli
Education Web site:
http://www.ibm.com/software/tivoli/education
Support Information
This section describes the following options for obtaining support for IBM
products:
v“Searching knowledge bases” on page ix
v“Obtaining fixes” on page ix
v“Contacting IBM Software Support” on page ix
viii IBM Tivoli Storage Manager for SAN for AIX: Storage Agent User’s Guide
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Searching knowledge bases
If you have aproblem with your IBM software, begin by searching the available
knowledge bases to determine whether the resolution to your problem is already
documented.
Search the information center on your local system or network: IBM Tivoli
Storage Manager provides an information center on aCD. You can run the
information center from the CD, or copy it to your local computer or an intranet
server. You can use the search function of this information center to query
conceptual information, instructions for completing tasks, reference information,
and support documents.
Search the Internet: If you cannot find an answer to your question in the
information center, search the Internet for the latest, most complete information
that might help you resolve your problem. To search multiple Internet resources
for your product, go to the support web site for the product www.ibm.com/
software/sysmgmt/products/
support/IBMTivoliStorageManager.html and look for the section to search the
support knowledge base. From this section, you can search avariety of resources
including:
vIBM technotes
vIBM downloads
vIBM Redbooks™
vForums and newsgroups
Obtaining fixes
Aproduct fix might be available to resolve your problem. You can determine what
fixes are available for your IBM software product by checking the product support
Web site:
1. Go to the Tivoli Storage Manager support Web site (www.ibm.com/software/
sysmgmt/products/
support/IBMTivoliStorageManager.html).
2. From this page you can view all product downloads or search for specific fixes.
To receive weekly e-mail notifications about fixes and other news about IBM
products, follow these steps:
1. From the support page for any IBM product, click My support in the
upper-right corner of the page.
2. If you have already registered, skip to the next step. If you have not registered,
click register in the upper-right corner of the support page to establish your
user ID and password.
3. Sign in to My support.
4. On the My support page, click Edit profiles in the left navigation pane, and
scroll to Select Mail Preferences.Select aproduct family and check the
appropriate boxes for the type of information you want.
5. Click Submit.
6. For e-mail notification for other products, repeat Steps 4and 5.
For more information about types of fixes, see the Software Support Handbook
(http://techsupport.services.ibm.com/guides/handbook.html).
Contacting IBM Software Support
IBM Software Support provides assistance with product defects.
About This Book ix
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Before contacting IBM Software Support, your company must have an active IBM
software maintenance contract, and you must be authorized to submit problems to
IBM. The type of software maintenance contract that you need depends on the
type of product you have:
vFor IBM distributed software products (including, but not limited to, Tivoli,
Lotus®,and Rational®products, as well as DB2®and WebSphere®products that
run on Windows®or UNIX®operating systems), enroll in Passport Advantage®
in one of the following ways:
–Online:Go to the Passport Advantage Web page (www.lotus.com/services/
passport.nsf/WebDocs/
Passport_Advantage_Home) and click How to Enroll
–By phone:For the phone number to call in your country, go to the IBM
Software Support Web site (http://techsupport.services.ibm.com/guides/
contacts.html) and click the name of your geographic region.
v
For IBM eServer™software products (including, but not limited to, DB2 and
WebSphere products that run in zSeries®,pSeries®,and iSeries™environments),
you can purchase asoftware maintenance agreement by working directly with
an IBM sales representative or an IBM Business Partner. For more information
about support for eServer software products, go to the IBM Technical Support
Advantage Web page (http://www.ibm.com/servers/eserver/techsupport.html).
If you are not sure what type of software maintenance contract you need, call
1-800-IBMSERV (1-800-426-7378) in the United States or, from other countries, go to
the contacts page of the IBM Software Support Handbook on the Web
(http://techsupport.services.ibm.com/guides/contacts.html) and click the name of
your geographic region for phone numbers of people who provide support for
your location.
Follow the steps in this topic to contact IBM Software Support:
1. Determine the business impact of your problem.
2. Describe your problem and gather background information.
3. Submit your problem to IBM Software Support.
Determine the business impact of your problem: When you report aproblem to
IBM, you are asked to supply aseverity level. Therefore, you need to understand
and assess the business impact of the problem you are reporting. Use the following
criteria:
Severity 1Critical business impact: You are unable to use the program,
resulting in acritical impact on operations. This condition
requires an immediate solution.
Severity 2Significant business impact: The program is usable but is
severely limited.
Severity 3Some business impact: The program is usable with less
significant features (not critical to operations) unavailable.
Severity 4Minimal business impact: The problem causes little impact on
operations, or areasonable circumvention to the problem has
been implemented.
Describe your problem and gather background information: When explaining a
problem to IBM, be as specific as possible. Include all relevant background
information so that IBM Software Support specialists can help you solve the
problem efficiently. To save time, know the answers to these questions:
xIBM Tivoli Storage Manager for SAN for AIX: Storage Agent User’s Guide

vWhat software versions were you running when the problem occurred?
vDo you have logs, traces, and messages that are related to the problem
symptoms? IBM Software Support is likely to ask for this information.
vCan the problem be re-created? If so, what steps led to the failure?
vHave any changes been made to the system? (For example, hardware, operating
system, networking software, and so on.)
vAre you currently using aworkaround for this problem? If so, please be
prepared to explain it when you report the problem.
Submit your problem to IBM Software Support: You can submit your problem
in one of two ways:
vOnline:Go to the ″Submit and track problems″page on the IBM Software
Support site (http://www.ibm.com/software/support/probsub.html). Enter
your information into the appropriate problem submission tool.
vBy phone:For the phone number to call in your country, go to the contacts page
of the IBM Software Support Handbook on the Web (http://
techsupport.services.ibm.com/guides/contacts.html) and click the name of your
geographic region.
If the problem you submit is for asoftware defect or for missing or inaccurate
documentation, IBM Software Support creates an Authorized Program Analysis
Report (APAR). The APAR describes the problem in detail. Whenever possible,
IBM Software Support provides aworkaround for you to implement until the
APAR is resolved and afix is delivered. IBM publishes resolved APARs on the
IBM product support Web pages daily, so that other users who experience the
same problem can benefit from the same resolutions.
For more information about problem resolution, see “Searching knowledge bases”
on page ix and “Obtaining fixes” on page ix.
Conventions Used in This Guide
vCommand to be entered on the AIX command line:
>dsmadmc
vCommand to be entered on the command line of an administrative client:
query devclass
About This Book xi

xii IBM Tivoli Storage Manager for SAN for AIX: Storage Agent User’s Guide

Changes for IBM Tivoli Storage Manager Version 5
This section summarizes changes that have been made to the Tivoli Storage
Manager product and this publication.
Changes for IBM Tivoli Storage Manager Version 5Release 4—
January 2007
The following changes have been made to the product for this edition:
Query Disk Space in aFILE Device Class
The new command QUERY DIRSPACE lets you display the amount of
total and available disk space for each directory in aFILE device class.
For details, see the Administrator’s Reference.
General Updates
Updates based on the input of users have been made throughout the book.
Changes for IBM Tivoli Storage Manager Version 5Release 3—
October 2005
The following changes have been made to the product for this edition:
General Updates
Updates based on the input of users have been made throughout the book.
Format volumes for z/OS LAN-free operations
For LAN-free operations, Tivoli Storage Manager previously required an
operation such as MOVE DATA or LAN-based backup to write data to the
tape so that it could be used from open systems. You can continue to use
this method. However, with this release, you can configure Tivoli Storage
Manager server to quickly and easily format LAN-free-capable volumes
dynamically when they are requested by the storage agent.
For full details, refer to the IBM Tivoli Storage Manager for z/OS
Administrator’s Guide and IBM Tivoli Storage Manager for z/OS
Administrator’s Reference.
Changes for IBM Tivoli Storage Manager Version 5Release 3—
December 2004
The following changes have been made to the product for this edition:
General Updates
Updates based on the input of users have been made throughout the book.
Automated Cartridge System Library Software (ACSLS) Enhancements
ACSLS library sharing is available. See “ACSLS, SCSI and 349X Tape
Library Sharing” on page 6for more information.
Multiple file system support for FILE device types
IBM Tivoli Storage Manager server improvements to sequential-access FILE
device type and random-access DISK device class storage requires that the
storage agent be able to access newly created FILE volumes. See “Disk
Devices” on page 28 for information.
©Copyright IBM Corp. 2000, 2007 xiii
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Minimum I/O to Volumes Associated with FILE Device Class
In Tivoli Storage Manager Version 5.3, the minimum I/O to avolume
associated with aFILE device class is 256 KB, regardless how much data is
being written to the volume. For example, if you are backing up one
500-byte object, it will take 256 KB of I/O to store it on the volume. In
terms of performance, the size of the I/O for avolume associated with a
FILE device class has the greatest impact when backing up or archiving a
large number of small objects (for example, small files or small directories).
To reduce the potential for performance degradation, you can increase the
size of aggregates created by the server. (An aggregate is an object that
contains multiple logical files that are backed up or archived from aclient
in asingle transaction.) To increase the size of aggregates, increase the
value of the TXNGROUPMAX option in the server options file
(dsmserv.opt) or increase the value of the TXNGROUPMAX parameter on
the REGISTER NODE or UPDATE NODE server commands. In addition to
increasing the TXNGROUPMAX value, you might also need to increase the
values for the following options:
vThe client option TXNBYTELIMIT in the client options file (dsm.opt)
vThe server options MOVEBATCHSIZE and MOVESIZETHRESH
For details about the server options and commands, refer to the
Administrator’s Reference.For details about the client option
TXNBYTELIMIT, refer to the Backup-Archive Clients Installation and User’s
Guide.
Note: For certain tasks (for example, using content-management products,
using the DIRMC client option to store directory information, or
migrating very small files using the hierarchical space management
(HSM) client), you can minimize wasted space on storage volumes
in aFILE-type storage pool by specifying the NONBLOCK data
format when defining the storage pool. In most situations, however,
the NATIVE format is preferred.
Changes for IBM Tivoli Storage Manager Version 5Release 2—January
2004
The following changes have been made to the product for this edition:
General Updates
Updates based on the input of users have been made throughout the book.
Anew section for automating the storage agent startup has also been
added. See “Automating the Storage Agent Startup” on page 43 for more
information.
Changes for IBM Tivoli Storage Manager Version 5Release 2—June
2003
The following changes have been made to the product for this edition:
LAN-free for z/OS
Tivoli Storage Manager now supports LAN-free data movement in storage
area network (SAN) environments on the z/OS®and OS/390®operating
systems. The z/OS or OS/390 server acts as the data manager for aclient
that uses astorage agent See Chapter 2, “Planning,” on page 5for an
xiv IBM Tivoli Storage Manager for SAN for AIX: Storage Agent User’s Guide
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overview of this function. For full details, refer to the IBM Tivoli Storage
Manager for z/OS Administrator’s Guide and IBM Tivoli Storage Manager for
z/OS Administrator’s Reference.
Product Packaging and Name Changes
Product packaging and names for Tivoli Storage Manager have been
updated. See www.ibm.com/software/tivoli/solutions/storage/ for
complete details.
Configuration Information Worksheets
Client and server configuration information worksheets have been added
to the Planning chapter to aid the user in more quickly installing and
configuring the storage agent. See “Configuration Information Worksheets”
on page 13 for details.
Changes for IBM Tivoli Storage Manager Version 5xv

xvi IBM Tivoli Storage Manager for SAN for AIX: Storage Agent User’s Guide

Chapter 1. Storage Agent Overview
IBM Tivoli Storage Manager for Storage Area Networks is afeature of Tivoli
Storage Manager that enables LAN-free client data movement.
This feature allows the client system to directly write data to, or read data from,
storage devices attached to astorage area network (SAN), instead of passing or
receiving the information over the network. Data movement is thereby off-loaded
from the LAN and from the Tivoli Storage Manager server, making network
bandwidth available for other uses. For instance, using the SAN for client data
movement decreases the load on the Tivoli Storage Manager server and allows it to
support agreater number of concurrent client connections. See Figure 1on page 2.
The storage agent, acomponent of the feature, makes LAN-free data movement
possible.
The storage agent can support several clients while installed on only one of the
clients. You can install the storage agent on aclient machine that shares storage
resources with the Tivoli Storage Manager server (Figure 1on page 2) or on a
client machine that does not share storage resources but is connected to aclient
machine that does share storage resources with the Tivoli Storage Manager server.
Figure 2on page 2shows multiple clients connected to aclient machine that
contains the storage agent. You must specify the LANFREECOMMMETHOD
option in the client system options file (dsm.sys) to allow the client machine (that
shares storage resources) to communicate with the storage agent. ATivoli Storage
Manager server, acting as alibrary manager, controls the storage devices. This
server may be the server working in conjunction with the storage agent or another
Tivoli Storage Manager server in the enterprise. The Tivoli Storage Manager server
keeps track of the metadata that the client has stored. The metadata, such as policy
information and file name and size, is passed over the LAN connection between
the storage agent and server.
©Copyright IBM Corp. 2000, 2007 1

Client
Storage Agent installed
Tape Library
File Library
Library Control
Client Metadata
Library
Control
Client
Data
SAN
LAN
Tivoli Storage Manager Server
Figure 1. SAN Data Movement. Solid lines indicate data movement. Broken lines indicate
movement of control information and metadata.
Client
Client
Tape Library
File Library
Library Control
Client Metadata
Library
Control
Client
Data
Client
Data
SAN
LAN
Tivoli Storage Manager Server
Client
with
Storage Agent
Figure 2. SAN Data Movement with the LANFREECOMMMETHOD option. Solid lines
indicate data movement. Broken lines indicate movement of control information and
metadata. The LANFREECOMMMETHOD option allows the storage agent to support several
clients while installed on only one of the clients.
2IBM Tivoli Storage Manager for SAN for AIX: Storage Agent User’s Guide