Our primary (and only) storage is a Data Domain. Be careful when reclaiming virtual tapes. It works perfectly but servers backing up to the Data Domain have their bandwidth throughput drop from 85% to 5% during reclamation. This was determined by watching Windows Task Manager network utilization with reclamation running and then cancelled.
Our reclamation threshold is set at 95% and runs for about 20 minutes. The SQL storage pool that holds 1.1 TB files is set at 99% to effectively prevent reclamation. We had a bad weekend where reclamation started Friday at 5 PM and was 60% complete Monday morning before being cancelled. All of those weekend backups were slowed and the database backup ran 5 hours instead of 1.75 hours. Don't make my mistakes! Jim Schneider -----Original Message----- From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Ehresman,David E. Sent: Tuesday, December 18, 2012 2:38 PM To: ADSM-L@VM.MARIST.EDU Subject: Re: [ADSM-L] Reclamation of Virtual Tapes We reclaim our virtual tapes. They have the same waste patterns as physical tape and are certainly as expensive. David -----Original Message----- From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Lee, Gary Sent: Tuesday, December 18, 2012 2:10 PM To: ADSM-L@VM.MARIST.EDU Subject: Re: [ADSM-L] Reclamation of Virtual Tapes Sounds like someone set the reclaim storage pool on the virtual tape pool to the physical tape pool. I know of no reason why not to reclaim virtual tapes. Wish I had one to play with. Gary Lee Senior System Programmer Ball State University phone: 765-285-1310 -----Original Message----- From: ADSM: Dist Stor Manager [mailto:ADSM-L@VM.MARIST.EDU] On Behalf Of Welton, Charles Sent: Tuesday, December 18, 2012 11:10 AM To: ADSM-L@VM.MARIST.EDU Subject: [ADSM-L] Reclamation of Virtual Tapes Hello: We have a TSM instance that uses virtual tapes as our primary backup data pool. The data on the virtual tapes are eventually migrated to tape. We are currently down to 3 virtual scratch tapes and 6 physical scratch tapes. I noticed that we are not running any reclamation processes on our virtual tape pool. It seems we have a hand-full of under-utilized virtual tapes. I went ahead and ran a manual reclamation on the virtual tape pool and I noticed the output tape pool is a physical tape. I assumed that the virtual tape would reclaim to another virtual tape. Is that not the case? Could there be a reason why reclamation shouldn't be ran on a virtual tape pool? Thank you... Charles This email contains information which may be PROPRIETARY IN NATURE OR OTHERWISE PROTECTED BY LAW FROM DISCLOSURE and is intended only for the use of the addresses(s) named above. If you have received this email in error, please contact the sender immediately. ********************************************************************** Information contained in this e-mail message and in any attachments thereto is confidential. If you are not the intended recipient, please destroy this message, delete any copies held on your systems, notify the sender immediately, and refrain from using or disclosing all or any part of its content to any other person.
