Thank you very much Colin.
I will configure storage pools with device class FILE.
Grigori G. Solonovitch
Senior Technical Architect
Information Technology Bank of Kuwait and Middle East http://www.bkme.com
Phone: (+965) 2231-2274 Mobile: (+965) 99798073 E-Mail: G.Solonovitch AT bkme
DOT com
Please consider the environment before printing this Email
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Colin Dawson
Sent: Wednesday, April 29, 2009 6:48 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] TSM 6.1 deduplication is invalid option for disk primary
pools
Grigori,
The primary decision for limiting deduplication to device classes of
DEVTYPE=FILE has to do with the deduplication processing itself. Once a
data chunk has been identified as being a duplicate of an existing data
chunk, the TSM server leverages the reclamation and aggregate
reconstruction algorithms. These algorithms are only available for device
classes that exploit a device type of sequential media. So, the design
decision or rational was to do this for DEVTYPE=FILE because the necessary
infrastructure was more readily in place then what was available for
DEVTYPE=DISK.
Thanks,
Colin
-----------------------------------------------------
Colin Dawson
TSM Server Development
colind AT us.ibm DOT com
From: Grigori Solonovitch <G.Solonovitch AT BKME DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: 04/29/2009 05:38 AM
Subject: [ADSM-L] TSM 6.1 deduplication is invalid option for disk primary
pools
Hello Everybody,
I am testing TSM 6.1 under AIX.
I have tried to enable de-duplication for primary disk pool:
tsm: BKME>upd stg daily_1 dedup=y
ANR2344E UPDATE STGPOOL: The "DEDUPLICATE" option is not valid for device
class DISK.
ANS8001I Return code 3.
tsm: BKME>
I have been affected too much by this message, because most of our primary
pools are on FATA disks.
Could somebody explain me why IBM is not able to use de-duplication for
device class DISK?
What is behind this?
I understand I was reading all available before documentation not enough
carefully, because I was sure that it is much easier to de-duplicate data
on disks in comparison with tape drives.
Kindest regards,
Grigori G. Solonovitch
Senior Technical Architect
Information Technology Bank of Kuwait and Middle East http://www.bkme.com
Phone: (+965) 2231-2274 Mobile: (+965) 99798073 E-Mail:
G.Solonovitch AT bkme DOT com<mailto:G.Solonovitch AT bkme DOT com>
Please consider the environment before printing this Email
Please consider the environment before printing this Email.
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