IBM supplies a perl script to measure the cost of dedup.
See http://www-01.ibm.com/support/docview.wss?uid=swg21596944
I just ran it in an instance with an 800 GB db, here are the final summary
lines -
Final Dedup and Database Impact Report
--
Yes, one of the two. If TSM deduplication is enabled and the target is a
virtual tape, i doubt if the VTL can deduplicate anything from the write data.
On Thu, 6/12/14, Ehresman,David E. wrote:
Subject: Re: [ADSM-L] TSM and VTL Deduplication
To: AD
Unless you have a specific requirement, I would suggest you choose either TSM
dedup to disk or go straight to virtual tape. There is not usually a need to
do both.
David
-Original Message-
From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Dan
Haufer
Sent: Thursd
Thanks for all the answers. So SSDs (Looking at SSD caching) for the database
storage and 10GB per TB of total backup data on the safer side.
On Thu, 6/12/14, Erwann Simon wrote:
Subject: Re: [ADSM-L] TSM and VTL Deduplication
To: ADSM-L@VM.MARI
Hi,
I'd rather say 6 to 10 times, or 10 GB of DB for each 1 TB of data (native, not
deduped) stored.
--
Best regards / Cordialement / مع تحياتي
Erwann SIMON
- Mail original -
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Envoyé: Jeudi 12 Juin 2014 16:55:29
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Be prepare for your database size to double or triple if you are using TSM
deduplication.
-Original Message-
From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of
Prather, Wanda
Sent: Thursday, June 12, 2014 7:15 AM
To: ADSM-L@VM.MARIST.EDU
Subject: Re: TSM and VTL Ded
And if you are on the licensing-by-TB model, when it gets un-deduped (reduped,
rehydrated, whatever), your costs go up!
-Original Message-
From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Dan
Haufer
Sent: Thursday, June 12, 2014 9:48 AM
To: ADSM-L@VM.MARIST.EDU
Su
Understood. Thanks !
On Thu, 6/12/14, Ehresman,David E. wrote:
Subject: Re: [ADSM-L] TSM and VTL Deduplication
To: ADSM-L@VM.MARIST.EDU
Date: Thursday, June 12, 2014, 5:33 AM
If TSM moves data from a
(disk) dedup pool to tape, TSM has to un-dedu
And, I would add, change the "*.*" construct to a "*" pattern. The first only
INCLUDEs files with a dot in the name, maybe not what you want. Most Windows
files have a dot, but not all!
STEPHEN STACKWICK | Senior Consultant | 301.518.6352 (m) |
stephen.stackw...@icfi.com | icfi.com
ICF INTERNA
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
Sub
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 anyon
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