And that's why storage pool planning is very important. The less re-duping, hydrating, inflating you do the better. Client data to a non-deduped (I guess that would be a duped) pool that migrates to a deduped pool. But backup stgpool before the migration happens to avoid the re.
This is where I expect I'll be corrected: as long as the backup stg happens before the deduplication process on the file devtype storage pool the reduping won't have to happen. (we weren't really talking about collocated copy pools were we?) But then you wouldn't have a file devtype pool migrating to tape very often anyway would you? And if you did, that would only be in an emergency situation (i.e., you ran out of room on disk). And in that case why would you collocate? Ah, the words of someone that used to think he knew what he was talking about! Kelly J. Lipp Elbert Colorado 719-531-5574 -----Original Message----- From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Prather, Wanda Sent: Tuesday, June 21, 2011 12:27 PM To: ADSM-L@VM.MARIST.EDU Subject: Re: [ADSM-L] Deduplication and Collocation Dedup only works in TSM storage pools that reside on disk (specifically devtype=FILE pools). If you have data that goes to a dedup pool, then gets migrated off to tape, it is reduped (rehydrated, reinflated, whatever you want to call it.) So collocation will still be in effect for that pool. -----Original Message----- From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Mark Mooney Sent: Tuesday, June 21, 2011 2:17 PM To: ADSM-L@VM.MARIST.EDU Subject: [ADSM-L] Deduplication and Collocation Hello, I had a student ask me today "What happens if you have collocation turned on for a storage pool that you are deduplicating?" I did not know what to answer because in my mind I thought "well, if the data is collocated then I need to have a copy of that data on that client's tape, otherwise I am going to be mounting another client's tape to get back a de-duped piece of data which would negate the collocation" I'm looking at the redbooks for this but I only see 6.1 and in 6.2 they added client side dedup as well (which I also have questions about) Can anyone shed some light on this? Thanks! Mooney
