Don't collocate the copy storage pool. Obviously, each day at least one tape will go out that is not full. No avoiding that. However, if you agressively reclaim the copy storage pool the number of tapes in that pool will be minimized.
For instance, let's say you send a 10% full tape out on Monday morning. Then on Tuesday morning you do another backup stg thus creating another 10% full tape. Then reclamation runs. Monday's data is appended to the Tuesday tape and the Monday tape is marked empty (or vaultretrieve if DRM is in use). Now Tuesday's tape is 20% full. Proceeding on through the week reclamation takes longer and longer, but each tape goes out fuller and fuller. Typically, copy pool reclamation is done weekly so you get seven mostly empty tapes per week but then get a mostly full one after reclamation and bring the seven home. My experience has shown that with reasonable copy pool reclamation you can keep the number of tapes in the copy pool to 1.2 to 1.5 times the number in the primary pool. That assumes you bring them back occassionally as well. Kelly J. Lipp Storage Solutions Specialists, Inc. PO Box 51313 Colorado Springs, CO 80949 [EMAIL PROTECTED] or [EMAIL PROTECTED] www.storsol.com or www.storserver.com (719)531-5926 Fax: (240)539-7175 -----Original Message----- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED]]On Behalf Of Kyle Sparger Sent: Thursday, October 25, 2001 7:37 AM To: [EMAIL PROTECTED] Subject: Tape Copy pools and Colocation Hello, I'm starting to implement tape copy pools. My primary pool has colocation enabled, in order to speed up restores. My primary storage pool currently is using 27 tapes at varying degrees of usage. When I did a test BACKUP STGPOOL, the output indicated that it wanted to use another 27 tapes, even though that would end up leaving unused space on each tape. I expect that the copy pool will not be used a whole lot; I intend to move these tapes out of the library after each backup, and as such, prefer density and tape efficiency to speed of recovery from these tapes. I was wondering if there is a way to have it use the copy pool such that it uses the fewest tapes possible, filling up each tape fully before pulling another one from scratch. Or, does it do this already, and is the test run just being ultra-conservative? Thanks, Kyle Sparger - System Administrator [EMAIL PROTECTED] - http://www.dialtone.com Voice - (954) 581-0097 x 122 Why do programmers get Halloween and Christmas mixed up? OCT(31)=DEC(25)
