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Re: Trying to understand iostat output
- To: misc_(_at_)_openbsd_(_dot_)_org
- Subject: Re: Trying to understand iostat output
- From: kami petersen <kokamomi_(_at_)_gueststars_(_dot_)_net>
- Date: Tue, 13 Dec 2005 18:20:36 +0100
Markus Wernig skrev:
I have a system (obsd3.8/sparc64) with 2 identical scsi drives (4
partitions + 1 swap each). The largest partition (10G) is mirrored over
the 2 drives as a ccd with interleave factor 16.
And 1.2M/s is rather less that what I'd have expected, is this figure
really the disk transfer rate?
my personal experience is that 16 is way too small. spend a few hours
benchmarking at increasing interleaves, and then make your decision. for
a 2 scsi disk system i ended up with an interleave of 312, judged on the
basis of bonnie benchmarking, wich lets you trade off raw speed, small
writes and cpu load.
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