From: rossman@columbia.edu
Date: Mon Nov 08 2004 - 07:23:59 EST
As follow-up to my previous post regarding (perceived) poor
disk IO performance on a V440 with a D1000 attached (DiskSuite),
running 1+0 RAID, I have done the following:
- Altered all LUNs so they mirror across two channels to a
split D1000.
- Changed the stripe size from a huge value to a more reasonable
one for UFS.
Performance remains about the same.
Question:
- What *random IO* data rates should I expect to see on a per-
spindle basis from a 10Krpm SCSI disk? I can get between 10
and 11 MB/s doing sequential reads on these disks, but I am
getting a miserable 1MB or less (mostly less) when the copy
is in progress. Is that normal/typical for UFS file reads
which amount to mostly random IO?
Ken Rossman
rossman@columbia.edu
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