Try a storage pool of the device class FILE, not DISK. It is FILE that
is supported for deduplication, although I haven't had a chance to use
deduplication yet, and my experience with FILE is fairly limited.


On Apr 29, 2009, at 7:37 AM, Grigori Solonovitch wrote:

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.