Fred Johanson writes: > > Once a tape has been mounted for a collocation group's data, > > all nodes in that group are migrated. > > At least when the source pool is of type DISK, I'd guess > > that files will still be ordered by filespace and node, > > just like they are by filespace in the case of collocation by node. > > Not always. I often find volumes with a few inches used belong to a client > belonging to a CG residing on another volume. It certainly looks as if > files ready for migration find the desired volume in use by another member > of the CG, so they go to scratch. > > As for reclamation, this morning I removed a client. 2 of its volumes > popped to the top of the list of reclamation candidates (2 reclamation > processes). > One went to the expected collector. The second went to scratch.
OK, I meant _normally_ (that is to say, when I'm watching). Rarely, I believe the same thing to happen here (we regularly run two migration processes in parallel). TSM Server 5.5.2.1, btw. I do manually clear out a few "duplicate filling" volumes per week & server, but then there are several more possible reasons, among them routine changes to collocation groups (new nodes getting backed up w/o being assigned a group, nodes removed from a group when they get too large). Occasionally I do see a filling volume with a large amount of data on it not being written to for a couple of days, while new data menawhile goes to a less occupied volume - in violation of the rule that the "fullest" tape was chosen first. Just another very-low-priority TSM bug, I'd guess ... Lately, I also discovered "phantom volumes": Filling, not appearing in any node's Q NODEDATA, no contents according to Q CONTENTS; but invariably MOVE DATA would find & move around some 2..3 files totalling a few Mbytes. Likely you have to REMOVE NODE more often than the average TSM operator, in order to see such things. [You'd also better(?) have some tool in addition to TSM SELECT in order to spot all of this weirdness. ;-] Best regards, Wolfgang J. Moeller <moel...@gwdg.de> Tel. +49 551 201-1516 ... not representing ... GWDG, Goettingen, Germany