From: Jonathan Williams (jonathw@shubertorg.com)
Date: Tue Oct 15 2002 - 12:06:27 EDT
Tru64 5.1, patch 3, Alpha ES40 machines.
I have a test machine here, and the only difference between it and our
production machines is that the production machines are on a SAN with HSG80
controllers, and the test machine is not on a SAN and has it's own HSZ70 disk
cabinet.
I'm trying to track down an informix restore slowness we've been noticing on
this test machine. I've been using 'collect' to capture data during various
restore and backup operations. I've come to the conclusion that it is
definitely a disk issue, and only with writing to the disks. When comparing
this test machine to a real production machine, all the numbers are pretty
close, except for a restore operation that writes to disks out on an HSZ70
controller. On the HSZ70, it seems to max out writing to disk at about 2500
KB/sec, while on our other systems that use an HSG80 write at about 5000 KB/sec
(which would explain why the restores take twice as long on this system).
Reading from the HSZ70 disks is much like the production machines at around 5000
KB/sec.
So I'm wondering, is this normal behaviour for an HSZ70? To write to it's disks
at around 2500 KB/sec...or is there a problem? I'm hoping that it's just a
difference between the two types of controllers. I've been looking at some of
the manuals, but can't find anything that seems too helpful.
Oh, and both the HSZ70 and the HSG80 use the same type of disks (DS-RZ1FC-VW
36.4GB).
TIA
Jonathan Williams
Unix Systems Administrator
The Shubert Organization, Inc.
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