Jurjen Oskam wrote:
Hi there,
some of you might remember that I encountered a problem when upgrading
TSM from 5.2 to 5.3. The problem was that FILE-volumes reached a premature
end-of-volume, causing a 64 MiB volume to only be 1,5 % used but still
be full.
The cause of this is now known, and it's not a bug but still something
to be aware of. In TSM 5.3, the handling of FILE volumes was changed.
All writes to such a volume is now done in blocks of 256 KiB minimum,
even when the object itself is much smaller.
In my case, the storagepool only contained directories. (DIRMC option
pointing to a small DISK pool, which migrated to the affected FILE pool)
In TSM 5.2 and earlier, this wasn't a problem. In 5.3 (and presumably
later), each tiny object now takes up 256 KiB at a minumum, causing
a *huge* overhead.
and IBM sells this as WAD? Does this also affect tape storage (not likely).
The solution was to stop using FILE volumes for this pool, but only DISK
volumes.
Regards,
--
Jurjen Oskam
--
Met vriendelijke groeten,
Remco Post
SARA - Reken- en Netwerkdiensten http://www.sara.nl
High Performance Computing Tel. +31 20 592 3000 Fax. +31 20 668 3167
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