I look after the companies TSM environment. Approx 700 servers back up an
average of 60-70gb per night. The ADSM server runs on OS/390 with 500 OS/2 and
200 NT clients. I have 2 primary disk pools, one of 45GB for the NT
servers(colocated) and one of 4GB for the OS/2 servers(non colocated). HIMIG is
set to 80% on the large pool and usually results is migration starting between 2
and 3am each morning and completing around 9am.
However the storage people have just been in touch wanting to know what I am
doing with so much disc in the large pool. Basically they want 30gb back leaving
leaving me with just 15gb. I suspect that things should continue to work just
with migration kicking it a lot earlier however I would welcome opinions.
Is there a recommended ratio of disk pool size to amount of data backed up. What
ratio do most people use. Are there quantifable performance impacts in running
migration at the same time as backups. I do know from experience that with
migration starting significantly earlier I can expect a lot of additional tape
mounts. But it might be argued so what.
Are there any other gotcha's
Gerard
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This document is strictly confidential and is intended for use by
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Allied Irish Banks
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