I do something like this, but what I do in a script is, if the reclamation threshold is not 100, and there is no offsite reclamation process running, I lower the reclamaiton threshold by 1. I also have a lower limit in the script.
Andy Carlson |\ _,,,---,,_ Senior Technical Specialist ZZZzz /,`.-'`' -. ;-;;,_ BJC Health Care |,4- ) )-,_. ,\ ( `'-' St. Louis, Missouri '---''(_/--' `-'\_) Cat Pics: http://andyc.dyndns.org/animal.html On Thu, 27 Mar 2003, Coats, Jack wrote: > I had similar issues. I found that if I did some reclamations each day, > and do something like reclaim 85% on Monday, Tuesday 80%, Wed 75% etc, > that it works pretty well over time than doing something like 50% every day, > even if that is your target. > > Why does this work? Basically it forces the 'most empty' tapes to be > recovered first. > > Why does it choose the files it does? This is a question for some TSM > internals > expert, but IMHO, if I was coding it, I would probably > 1. find the eligible tapes to reclaim in the selected storage pool > 2. on those tapes, list all the remaining files, > 3. sort the list of these remaining files by the tape they reside on > in > the local storage pool, > 4. find the local tape with the most files on it I need to move > 5. process that tape > 6. restart a 1 above > > If there is a TSM Internals guy, is that similar to what is done? Just > curious. > > -----Original Message----- > From: Matt Simpson [mailto:[EMAIL PROTECTED] > Sent: Thursday, March 27, 2003 8:52 AM > To: [EMAIL PROTECTED] > Subject: Offsite reclamation questions > > > When a reclaim process starts for offsite tapes, and I have a bunch > of tapes that are within the threshold, does anybody know how TSM > decides which volumes or files to reclaim first? When the > reclamation process starts, I see a whole bunch of messages like > > ANR1040I Space reclamation started for volume 500394, storage pool > BACKUPOFFSITE (process number 1514). > > apparently for every tape which meets the threshold. Is it going to > reclaim all the files for one volume before moving on to the next? > Or is it just going to start reclaiming all files on all those > volumes in some arbitrary sequence? > > The reason I care is that if we have limited time for reclamation and > can't reclaim all the eligible volumes within that window, I'd > obviously rather reclaim all the files from a few tapes and get those > tapes back than reclaim some files from a bunch of tapes and get none > of them fully reclaimed. > > Ideally, I'd like to see TSM start with the volumes with the highest > reclaimable space, which can be reclaimed most quickly. If it's not > going to do that, I might want to force it by setting the reclaim > threshold higher. > > We're using LTO tapes for our offsite copy pools. We're currently > setting the threshold at 50%, and I'm wondering if that's too low, > since that requires moving 100 GB to reclaim one tape. If I set it > higher, less data movement is required, but the tradeoff is that we > end up with more partially filled tapes in our vault. I'm starting > to think that's a reasonable tradeoff, since the lower threshold > might actually mean we have less chance to get any tapes fully > reclaimed. > > Any thoughts? > > > -- > > > Matt Simpson -- OS/390 Support > 219 McVey Hall -- (859) 257-2900 x300 > University Of Kentucky, Lexington, KY 40506 > <mailto:[EMAIL PROTECTED]> > mainframe -- An obsolete device still used by thousands of obsolete > companies serving billions of obsolete customers and making huge obsolete > profits for their obsolete shareholders. And this year's run twice as fast > as last year's. >