Poor IO performance after RAID failure

From: Hallen, Mark (Mark.Hallen_at_savvis.net)
Date: 08/24/04

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    Date: Tue, 24 Aug 2004 13:48:28 -0500
To: <sunmanagers@sunmanagers.org>

    Hello,

    We have a Sun-Fire-480R running Solaris 8 which has a GForce 2400 RAID
    unit connected to an Antares P-0076 Ultra 160 HBA. We general see about
    65M/s for write performance. When the RAID fails for some reason (I am
    powering it down for testing) and the system doesn't get rebooted, the
    write performance goes down to about 6M/s. We are trying to implement
    database mirroring across 2 of these RAIDs and it would be extremely
    nice to be able to maintain the original write performance when
    something fails without having to reboot the system. I have tried the
    following:

    umount the fs

    cfgadm -c unconfigure c3

    cfgadm -c configure c3

    mount the fs

    I would think that this would reset and probe the bus and we would be
    good to go, but I still see only 6M/s or so until the system is
    rebooted. I don't see any errors in the system log.

    Any suggestions or info would be greatly appreciated. I searched
    sunsolve and didn't come up with anything applicable.

    Thanks much,

    Mark Hallen
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