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    SubjectRe: Volume Managers in Linux
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    Date
    Shawn Leas <sleas@ixion.honeywell.com> writes:

    > On Tue, 3 Nov 1998, Albert D. Cahalan wrote:
    >
    > > > Wouldn't you like to push all that crap out to userspace?
    > >
    > > If you are serious about RAID in userspace, go away. I'll assume you
    > > didn't really mean to type that.
    >
    > Well... Software RAID performance suxorz anyway, but I absolutely

    Really?

    Pentium 166MMX 64 MB RAID M2954ESP + WDC AC22000L (raid0 + 4k fs block)

    -------Sequential Output-------- ---Sequential Input-- --Random--
    -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
    Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
    200 7277 95.0 16207 63.3 6473 51.9 6276 78.8 12670 40.5 155.0 4.8
    ^^^^^ ^^^^ ^^^^^ ^^^^^

    Pentium 166MMX 64 MB + SCSI Fujitsu M2954ESP 4GB

    -------Sequential Output-------- ---Sequential Input-- --Random--
    -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
    Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
    200 6491 89.3 7803 32.5 2759 23.0 5972 79.0 7111 24.5 92.2 3.5

    Pentium 166MMX 64 MB + UDMA WDC AC22000L 2GB

    -------Sequential Output-------- ---Sequential Input-- --Random--
    -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
    Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
    200 6199 88.7 7224 32.6 2559 22.0 6048 80.5 7117 25.4 65.5 2.1


    Next time you could test things before you preach. :)

    Regards,
    --
    Posted by Zlatko Calusic E-mail: <Zlatko.Calusic@CARNet.hr>
    ---------------------------------------------------------------------
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