Re: [ADSM-L] TSM 6.1 deduplication is invalid option for disk primary po

Subject:	Re: [ADSM-L] TSM 6.1 deduplication is invalid option for disk primary pools
From:	"Allen S. Rout" <asr AT UFL DOT EDU>
To:	ADSM-L AT VM.MARIST DOT EDU
Date:	Wed, 29 Apr 2009 09:36:09 -0400

>> On Wed, 29 Apr 2009 15:37:16 +0300, Grigori Solonovitch <G.Solonovitch AT 
>> BKME DOT COM> said:


> 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,

You want FILE devclasses, on random-access disk.  tape device classes
cannot dedupe.

- Allen S. Rout

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