From: ADSM: Dist Stor Manager [mailto:ADSM-L@;VM.MARIST.EDU]On Behalf Of Bill Boyer > Be careful of your copypool reclamations with the disk cache turned on!! > There is a BIG performance hit on reclamation when the primary copy of the > file is on a DISK direct access storage pool. Then the MOVESIZETHRESH and > MOVEBATCHSIZE values are thrown out the window and the files are processed > one at a time.
This is true *if* LTO tapes are in the mix. Apparently the aforementioned situation, in conjunction with the LTO backhitch process, makes for *slow* reclamations. > What I've done to relieve the restore times is to not MIGRATE the > disk pools > until the end of the day. That way restoring from last night is > quick. I had > a client where they wanted CACHE=YES on a 60GB disk pool. The offsite > copypool reclamation ran for 2-days! Changed it so that migration > started at 5:00pm and nobody complained about restore times. You can also do a move data on the disk volumes. That will clear the cache on an adhoc basis. -- Mark Stapleton ([EMAIL PROTECTED]) Certified TSM consultant Certified AIX system engineer MCSE
