ADSM-L

Re: [ADSM-L] Deduplication and Collocation

2011-06-21 15:50:41
Subject: Re: [ADSM-L] Deduplication and Collocation
From: "Prather, Wanda" <wPrather AT ICFI DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Tue, 21 Jun 2011 19:09:18 +0000
https://www-304.ibm.com/support/docview.wss?context=SSGSG7&lang=all&rs=2077&wv=1&loc=en_US&cs=UTF-8&uid=swg27018576&q1=tste_webcast&dc=DA410

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Mark Mooney
Sent: Tuesday, June 21, 2011 2:53 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] Deduplication and Collocation

Cool, Thanks :)  I have questions about client dedup.  Do you know of any 
redbook detail on that?

Thanks,
Mooney

"Prather, Wanda" <wPrather AT ICFI DOT COM> wrote:


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 AT VM.MARIST DOT EDU] On Behalf Of 
Mark Mooney
Sent: Tuesday, June 21, 2011 2:17 PM
To: ADSM-L AT VM.MARIST DOT 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