TDP SAP V6.3 on AIX - Deduplication

[MartyMcFly]

I have installed TDP for SAP on several machines and activated deduplication on the target storage pool (sequential file class).
I have configured the backup with one thread, diabled multiplexing and compression, set deuplication to server side.

RDBMS is Oracle 11g, Unicode , SAP is ERP 6.0 on all machines.

I tested each machine in a seperate storage pool.
The backup from Windows machines deduplicate very well. 3 full backups with 300 GB each needed 305 GB space on the TSM, 66% dedup ratio, that is, what i expected.

Backup from AIX 6.1 machines had a dedup-ratio of only 13%, after 3 full backups with 300 GB each, it reports 790 GB utilisation on the the TSM.

Do you have any idea why this happens? From my point of view, a tablespace file which is not changed between two backups should get fully deduplicated.

Thanks for any hint
Marty

 

[Jeroen]

using rman or not?
I assume rman backups will be less suitable for deduplication

 

[MartyMcFly]

No RMAN is used. Simple direct file transfer through backint.

 

[MartyMcFly]

After a lot of tests i decided to reinstall TSM client and TDP for ERP.
I now installed TSM 6.4 with TDP ERP 6.3.

After a few tests i found that setting BUFFSIZE to 1023kb solved the problem. Now i have dedup-ratios of about 92%.
Backup time is now about 2 hours with session set to 4, disabled multiplexing and compression and client deduplication. Database size 140 GB.

i will recheck this on the other AIX systems, if this is the solution.

best regards
Marty

 

[tomP]

Eventually this tech note would help -> http://www-01.ibm.com/support/docview.wss?uid=swg21575197