Hi, Define a script: Backup stg diskpoolX copypoolX wait=yes Backup stg tapepoolX copypoolX wait=yes Migrate stg diskpoolX
Define an admin schedule to run the script. If your diskpool is large enough to hold at least one day of backup data, you can turn on caching and always have the latest backup data on disk. Caching data on diskpool has some performance issues hitting backup's and migration (fragmentation!) performance. But, I can live with that. Regards, Karel -----Original Message----- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] On Behalf Of Skylar Thompson Sent: donderdag 19 oktober 2006 17:54 To: ADSM-L@VM.MARIST.EDU Subject: Re: Tivoli storage manager migration/backup Kelly Lipp wrote: > Yes there is a way to do write to two tapes simultaneously: one > primary and one copy. Use the copystg parameter on the primary pool > to set this. This action behaves with respect to the collocation > parameter on each pool. So if the primary pool is collocated and the > copy is not, the correct thing will happen. > > Also, remember we don't mirror tapes anyway and that term is not > appropriate. What we do is make sure that there are two copies of the > data: one copy in the primary pool and one in the copy pool. These > copies are created either by writing to the to pools at the time of > the client backup (which is not always practical) or by using the > backup stgpool command. > OK. I looked at simultaneous write, but we have so many clients that have been known to have over a terabyte of data to back up spread out over tens of millions of files that going to tape before going to disk seems like a bad idea. > In general, plan on writing to two tapes at the same time if the data > from the client is large. If it is not, consider sending data to a > disk based pool first, backing that up to the copy pool and then > migrating to the tape pool. > > Is there a way to guarantee that data is backed up to a copy tape pool before being migrated to the primary tape pool? We want to avoid any tape-to-tape transfers before we have two known-good copies that we can recover from. And I guess this is as good a place as any to ask: How are other people mitigating the primary tape pool as a single-point of failure? What do people consider the likelihood of tape failure between the time the disk cache is migrated to primary tape, and the primary tape is backed up to copy tape (probably ~24 hours)? For the record, we're using Ultrium3 tapes w/ hardware compression. -- -- Skylar Thompson ([EMAIL PROTECTED]) -- Genome Sciences Department, System Administrator -- K324, (206)-685-7354 -- University of Washington Medical Center
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