I previously had an 88G db @ 19% utilization spread over 3 dbvols.
2 dbvols on D: (hardware mirrored drive), and one on E: & F: (tsm
mirroring).
These drives were all on the same scsi controller (and same channel on
that controller).

I reorganized this so that I now have 4 db vols, with each one on a
separate disk. Tthe D: drive is still hardware mirrored, the other 3
dbvols are tsm mirrored.
During this reorg I sized them all the same (22GB), and also moved one
of the backplanes (3 drives) to a separate scsi controller.

The goal of all this was to spread the db i/o out over more spindles,
and more scsi controllers.  Unfortunately, what seems to have happened
is that tsm put pretty much all the db info into one dbvol, and is
leaving the others mostly empty.  The db is still 88gb, and still 19%
utilized.  End result was that I basically got no speed benefit out of
all the reorganizing.  Is there some way to force tsm to evenly
distribute the info, or does that involve the mythical unload/reload
that I occasionally hear about?



Troy Frank
Network Services
University of Wisconsin Medical Foundation
608.829.5384

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