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    SubjectTuning Linux for high-speed disk subsystems
    Hi all

    After some testing at Compaq's lab in Oslo, I've come to the conclusion
    that Linux cannot scale higher than about 30-40MB/sec in or out of a
    hardware or software RAID-0 set with several stripe/chunk sizes tried out.
    The set is based on 5 18GB 10k disks running SCSI-3 (160MBps) alone on a
    32bit/33MHz PCI bus.

    After speking to the storage guys here, I was told the problem generally
    was that the OS should send the data requests at 256kB block sizes, as the
    drives (10k) could handle 100 I/O operations per second, and thereby could
    give a total of (256*100)kB/sec per spindle. When using smaller block
    sizes, the speed would decrease in a linear fasion.

    Does anyone know this stuff good enough to help me how to tune the system?
    PS: The CPUs were almost idle during the test. Tested file system was



    Roy Sigurd Karlsbakk, MCSE, MCNE, CLS, LCA

    Computers are like air conditioners.
    They stop working when you open Windows.

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