Thanks. If you would post the APAR # back here when it becomes available, I would appreciate it.
Wanda -----Original Message----- From: ADSM: Dist Stor Manager [mailto:[email protected]] On Behalf Of Bent Christensen Sent: Tuesday, August 19, 2014 6:28 AM To: [email protected] Subject: [ADSM-L] Possible performance issue with TSM 7.1.0.x / DB2 10.5.x in large dedup environment Hi all, Just wanted to direct your attention to this blog entry by Josh-Daniel Davis if you are using TSM 7.1 in a large dedupped environment: http://omnitech.net/reference/2014/08/04/db2-10-5-0-1-negative-colcard We had a backup system in flames and 2 severity 1 PMRs open for more than 6 weeks with TSM L2 support and DEV being pretty clueless, and yesterday the problem was solved (fingers crossed) by changing the COLCARD value from a negative to a positive value as described in the above blog. We experienced this problem as db2syscs.exe constantly utilizing 80-85 % CPU on a 32-core server, growing queue of dereferenced chunks, fragments in FILE devclass pool volumes not being removed which renders those volumes unusable and expiration, reclamation and client backups failing or running very slow. There are no fixes (yet) and TSM support recommends regularly monitoring of the db2 tables for negative COLCARD values. Apparently a DB2 APAR IT03792 exists but it is pretty new and has not been published to external IBM websites yet. A TSM APAR is on its way. - Bent
