I'm having a problem with FILLING tapes multiplying out of control, which have very little data on them.
It appears that this happens at the end of migration, when that one last collocation group is being migrated, and all others have finished. TSM sees empty tape drives, and less than the defined number of migration processes running, and it decides it can use the drives, so it mounts fresh scratch tapes to fill up all the drives. This only happens when the remaining data to be migrated belongs to more than one node - but that's still fairly often. The result is a large number of FILLING tapes that contain almost no data. A rough formula for these almost-empty wasted filling tapes is: (number of migration processes - 1) * number of collocation groups Is there a way, short of combining collocation groups, to deal with this problem? We've got a very full tape library, and I'm looking for any obvious ways to get more data onto the same number of tapes. Ideally, I'd like there to be only one FILLING tape per collocation group. Roger Deschner University of Illinois at Chicago [email protected] Academic Computing & Communications Center ======I have not lost my mind -- it is backed up on tape somewhere.=====
