Greetings,

We are trying to evaluate the  possibility of introducing deduplication into 
our backups. Our initial deployment will be based on quadstor vtl 
http://www.quadstor.com/virtual-tape-library.html but at the same time we are 
trying to understand the TSM deduplication feature. Could anyone tell me what 
the following means from the TSM deduplication FAQ  
https://www.ibm.com/developerworks/community/wikis/home?lang=en#!/wiki/Tivoli%20Storage%20Manager/page/Deduplication%20FAQ

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 (Q4) When should I consider using TSM deduplication?

    Consider using TSM deduplication when the following conditions apply:
        You plan to use a disk-only backup solution (your primary backup 
storage pool will remain on disk).
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I understand why the backup pool should be a disk pool, but the "disk-only 
backup solution" confuses me. Does tape migration cause any effects ?

TSM Server version v6.3.3
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