If TSM moves data from a (disk) dedup pool to tape, TSM has to un-dedup the data as it reads it and sends it to tape.
-----Original Message----- From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Dan Haufer Sent: Thursday, June 12, 2014 8:03 AM To: ADSM-L@VM.MARIST.EDU Subject: [ADSM-L] TSM and VTL Deduplication 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 -- (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). -- 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 --
