Joni / Rob, I believe that is a bit risky. A Reuse Delay of zero means a tape is a candidate for reuse immediately after being emptied. If you reuse your tapes that soon, and you have to restore back to an earlier DB backup, there will be lots of files that are no longer where TSM expects to find them. You can restore them from the copypool(s), but that can take a while. In the meantime, TSM will be spitting out MILLIONS of error messages onto the console and into the Act Log.
We set our Reuse Delay for primary pools to 2 days; and 5 days for copypools and any primary pools whose volumes are stored off-site. The idea is that you should have AT LEAST ONE database backup that records the new location of the files that used to be on those tapes. This has come up before on the list, and if you're "fat" with tapes, you can set it for however long you retain your database backups. Since we do daily DB backups, those delay settings ensure that we get at least two DB backups before any tapes get reused. If I find myself needing a "pending" tape prior to the reuse period elapsing, I always manually launch a DB backup before flipping its status. Tab Trepagnier TSM Administrator Laitram, L.L.C. "ADSM: Dist Stor Manager" <ADSM-L@VM.MARIST.EDU> wrote on 03/07/2005 03:16:02 PM: > Hi Rob, > > I believe that the primary storage pools should have a reuse parameter of 0 > and your reuse delay should be the same retention as the database backup > retention so that you can go back in history. I believe that there is > supporting info. within the TSM Admin Guide that should detail this info. > concerning storage pools. Hope that helps! > > ******************************** > Joni Moyer > Highmark > Storage Systems > Work:(717)302-6603 > Fax:(717)302-5974 > [EMAIL PROTECTED] > ******************************** > > > > "Rob Hefty" > <[EMAIL PROTECTED] > Y.COM> To > Sent by: "ADSM: ADSM-L@VM.MARIST.EDU > Dist Stor cc > Manager" > <[EMAIL PROTECTED] Subject > .EDU> Volume Reuse Parameter > > > 03/07/2005 04:12 > PM > > > Please respond to > "ADSM: Dist Stor > Manager" > <[EMAIL PROTECTED] > .EDU> > > > > > > > Hello all, > > I was wondering if anyone was willing to offer up any ideas on what this > parameter should be set to for tape storage pools; both primary and > copy? > > Thanks!
