400% disk utilization!

  • From: "Andrea Coppini" <andreacoppini@xxxxxxxx>
  • To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>, <exchange@xxxxxxxxxxxx>
  • Date: Tue, 1 Oct 2002 12:07:48 +0200

I've been using PerfMon for a while today to monitor our Exchange 2k
server.  Every so often, for no apparent reason, %disk time for disk 1
(E:) goes up to 100% and stays there for a good 30 seconds.  Disk 0
(C:,D:) stays low.

I tried doing an Advanced find for some text in all my mailbox, but
%disk time fluctuates around 90%... It never stays steady at 100%.

Also, looking at the statistics under the perfmon graph, I noticed that
it showed 415 as the Maximum...

Any idea what could be causing this?  Here's a few specs:

C,D = single SCSI RAID5 set 3x 10,000rpm 36gb Disks, storing system on
C:, transaction logs on D:
E:  = single SCSI RAID5 set 3x 10,000rpm 36gb disks, storing IS.

1.2gb RAM
Single P3-700 CPU
HP Netserver LC2000r machine.

One concern that I have is that both RAID5 sets are on the same SCSI bus
(we weren't supplied with the necessary cable and split backplane when
we initially installed the server).  Would this affect it?


Andrea Coppini
+356 79 ANDREA (263732)


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