FC Disk array

From: Michael E.Conlen (meconlen_at_obfuscated.net)
Date: 01/03/05

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    To: freebsd-performance@freebsd.org
Date: Mon, 3 Jan 2005 14:32:46 -0500

    I have a system connected to a IBM Fast-t 100 fiber channel disk array
    that I'm using as an NFS server. It's handling a moderate load of write
    operations, normally in the range of 4 to 8 MB/sec with an average
    write size of 16k constantly. The odd thing I've noticed in gstat and
    systat is that the system reports the disk as over 100% busy at times.
    I once saw it as high as 150%. I don't care that it does this, but it
    makes me wonder what the ceiling is.

    The system is a dual Xeon HT with hlt_logical_cpu set to 0 so I'm used
    to getting 400% worth of CPU in some of my metrics. 

    --
Michael Conlen
meconlen@obfuscated.net
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