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IBM TSM : Question about storage pool

Posted on 2014-02-19
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Last Modified: 2014-02-20
Hello experts,

I do not understand something about Diskpools in IBM TSM.

My DISKPOOL which is highlighted in yellow on the image Bellow has 4 terrabytes of  freespace  but  my backups fails and I get a  "Server out of data storage space " error message.
Please help me to understand and tell me which recovery threshold should I use

Disk pool status
Disk Pool Status

Pool configuration

seuil de recuperation means recovery threshold
Disk Pool Config
Volumes status
storagepool-volumes-status.txt
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Question by:cismoney
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woolmilkporc earned 500 total points
ID: 39870884
This pool is not a "diskpool" (random access) but a files-based sequential storage pool with a device class of NTFDISK. A true random access disk pool would have a device class of "DISK".

So this sequential pool has reached its configured maximum of "scratch" volumes.
Nearly all volumes are "Full", and the remaining 7 "Filling" volumes are probably not useable for the particular request, maybe due to collocation restrictions.  One of them is just undergoing a "Space Reclamation" process, I assume.

There is just one reclamation process allowed for this pool at a time.
Please check if such a process is running (Q PR), and if so try to find out if, and if so why it's not coming to an end.
Also, the few "Filling" volumes do not have much capacity to accommodate the remnants of a space reclamation.

If the involved disks still have free space you could try and increase the maximum allowed number of "scratch" volumes (MAXSCR) for this pool.

Then you could also increase the MIGPROCESS value for this storage pool. Should be no problem because no external mountpoints are required for a "file" reclamation.

Salut!

wmp
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by:cismoney
ID: 39871943
Thanx for your quick response. I have a question what is the best recovery threshold that I need to put for best practice, to make sure I tsm recover volumes fast
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by:woolmilkporc
woolmilkporc earned 500 total points
ID: 39872078
Do you mean "Reclamation Threshold"?

The default of 60% is rather reasonable - since 60% threshold (=reclaimable data) means 40% active data you can reclaim two volumes with 60% reclaimable space each (=40% active data each) to a single scratch volume of equal size which will then be 80% full and you will have two empty or scratch volumes afterwards.

You could lower the threshold if you have quite a lot of partially (less than the desired threshold) filled volumes which you hope to exploit better by that measure.

Let's assume you lower the threshold to 40% then you'll need a volume with at least 60% free space (which means with at most 40% (= threshold) occupied space) to accommodate the remnants of a single reclaimed volume - otherwise there wouldn't be any net gain in the number of free volumes.

Short - I'd recommend keeping the default or changing at most to 55%, for the above reasons.
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