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Installation and User's Guide

Installation and User's Guide

Installation and User's Guide

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►►ENABLEARCHIVERETENTIONProtectionNoYes►◄EnablededupcacheParametersNo The data retention server connection is refused. This is the default.YesThe client connects to a data retention server.Use the enablededupcache option to specify whether you want to use a cacheduring client-side data deduplication. Using a local cache can reduce networktraffic between the Tivoli Storage Manager server <strong>and</strong> the client.When you perform a backup or archive operation with the data deduplicationcache enabled, the specification of data extents that are backed up or archived aresaved to the cache database. The next time you run a backup or archive, the clientqueries the data deduplication cache <strong>and</strong> identifies the extents of data that havebeen previously saved to the server. Data extents that are identical to data extentson the server are not resent to the server.If the server <strong>and</strong> the cache are not synchronized, the cache is removed <strong>and</strong> a newone is created.Only one process can access the distributed data deduplication cache at a time.Concurrent backup instances on a workstation, that use the same server <strong>and</strong>storage pool, must either use unique node names or unique cache specifications. Inthis way, all the instances can use a local cache <strong>and</strong> optimize the client-side datadeduplication.Supported ClientsThis option is valid for all clients. The Tivoli Storage Manager client API alsosupports this option.Options FilePlace this option in the client options file (dsm.opt). You can set this option on theDeduplication → Enable Deduplication Cache check box of the Preferences editor.The option can be set in the client option set on Tivoli Storage Manager server.Syntax►►ENABLEDEDUPCacheYes*No►◄ParametersYesSpecifies that you want to enable data deduplication cache. If data358 IBM Tivoli Storage Manager for Windows Backup-Archive Clients: <strong>Installation</strong> <strong>and</strong> <strong>User's</strong> <strong>Guide</strong>

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