Hi Paul
A strange volume config indeed....
One thing I'd ask is when was the last time this server was
unloaded/reloaded ?
Chris
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Paul van Dongen
Sent: Friday, July 01, 2005 11:38 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] Very slow DB backups
Hello All,
I was called to examine a TSM server in order to make some
suggestions to improve performance. Upon arrival, I found out a
not-so-standard configuration:
TSM 5.1.6.4 on HP-UX 11
DB: 208 GB split on 208(!) volumes of 1GB each spread on 4 LUNs on an
EMC box (95% in use)
Log: 10 volumes of 1GB each, all on the same EMC LUN
Diskpool: 101 volumes of 1GB each, all on the same EMC LUN
I know that splitting this server should be the best solution, and there
are other factors contributing to this big DB size, but I will stay away
from this for while.
The first I noticed is that there are two full DB backups being executed
each day. They go to a LTO device class, and are taking some 3 to 4
hours to complete, including a stange 5 to 10 minute "sleep" between the
backup command being issued and the actual start of the process. I tried
to minimize this by setting the log to rollforward and trying to take a
incremental backup. To my surprise, the triggered incremental (log
became 70% full) started, with the same delay described above, but began
to crawl, at 8000 pages per MINUTE. It would give me almost 4 hours to
copy the 7 or so GB!! Naturally, I went back to the fulls until I found
out what could be the problem.
I am trying to talk to the admin of this server to upgrade to 5.2 or 5.3
and to review their disk config, but would like to hear from you if
someone has been trough something alike, and of course the line of
action that was taken.
Thanks to all,
Paul
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