Do not forget about DB backup sent off-site. Most probably you are moving them but did not mentioned. The reusedelay and DB backup retension should set that only after a DB backup with information about the new volume where data is copied as result of copy pool reclamation the old reclaimed tape can become "empty" and be brought on-site.
Zlatko Krastev IT Consultant Justin Derrick <[EMAIL PROTECTED]> on 24.01.2002 15:05:30 Please respond to "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] cc: Subject: Mitigating Risk with TSM's incremental backups I've been using TSM for quite a few years on AIX, and surprisingly, this issue hasn't come up before. My customer is using TSM in conjunction with Content Manager OnDemand. The config looks like this: AIX 4.3.3 on H70 OnDemand, DB2, TSM Data is cached on disk (by OnDemand, not TSM), and also copied to Optical (a la 3995), then backed up to LTO. They are currently a very low-volume shop, adding under 1GB a day to the TSM system. The question raised to which I didn't have a good answer was: If we take a non-full LTO offsite for disaster recovery purposes, then bring it back onsite as part of regular rotation, a vulnerability is created. If the tape is on site when a disaster occurs (which would always be the case since their courier only delivers once a day), not only is that day's information lost, but all the previous days of incrementals previously written to the tape are destroyed as well. I know we could keep multiple copypools in the chain, but it seems like an expensive solution to a simple problem. The immediate solution would be to create new 'full' backups of the contents of the optical jukebox every day, and take them offsite. While this would actually be feasible in the short term (given their low growth) it would quickly become unmanagible in the future. Is the solution to simply buy enough tapes so that you simply send one tape a day offsite for as long as possible, then perform large reclaimation once every 'long as possible'? This sounds like it's within the realm of the DRM, which I'm woefully inexperienced with. Any advice, direction, etc. would be greatly appreciated. -JD.
