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    SubjectRe: Linux i/o tweaking
    I guess the question I'd ask would be what kinda number do you expect from 
    the raid 5 stripe. 107MB/s sounds like a reasonable number from a two
    channel u160 controller...

    my previous best is around 89MB/s with 4 cheetah 15K 18gb drives raid/0

    On Thu, 15 Nov 2001, Roy Sigurd Karlsbakk
    wrote:

    > Hi all
    >
    > After three days at Compaq's lab in Oslo, testing their medium-level
    > servers and storage systems with Linux, I've come to some sort of
    > conclusions, although these may be wrong. I also have come over a few
    > problems that I couln't find a good solution to.
    >
    > * When running RAID from a Compaq Smart 5302/64 controller, software
    > RAID-5 is (slightly - ~15%) faster (on JBOD - each disk is configured as
    > a RAID-0 device with max - 256kB - stripe size) than the
    > hardware/controller based RAID-5. Both CPUs (1266MHz/512kB cache) are
    > maxed out by reading from software RAID-5 (???), giving me >= 107MB/s on
    > two SCSI-3 buses with six disks on each bus.
    >
    > * Even though I can get up to 25 MB/s from each disk, I can't get more
    > than 107 MB/s on the whole bunch (12 drives). It doesn't help much to do
    > RAID-0 either. Don't understand anything ...
    >
    > Thanks for all help.
    >
    > roy
    >
    > --
    > Roy Sigurd Karlsbakk, MCSE, MCNE, CLS, LCA
    >
    > Computers are like air conditioners.
    > They stop working when you open Windows.
    >
    >
    >
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