Re: Vinum performance

From: Drew Tomlinson (drew_at_mykitchentable.net)
Date: 05/30/03

  • Next message: Rich Morin: "Re: Boot problem: "ata0: resetting devices"" 
    To: <peo@intersonic.se>, "Chuck Swiger" <cswiger@mac.com>
Date: Fri, 30 May 2003 11:57:33 -0700

    ----- Original Message -----
    From: "Per olof Ljungmark" <peo@intersonic.se>
    To: "Chuck Swiger" <cswiger@mac.com>
    Cc: <freebsd-questions@freebsd.org>
    Sent: Friday, May 30, 2003 8:41 AM

    > > What ratio of reads to writes do you expect?
    >
    > Had no expectations really, I'm new to Vinum.
    >
    > >> Copying 170 files total 319MB TO the Vinum volume takes about 2m45s.
    > >> Copying same files FROM the Vinum volume to another volume on a
    > >> hardware raid5 controller takes 43s.
    > >
    > >
    > > A 3-1 ratio in speeds for software RAID-5 versus hardware doesn't strike
    > > me as being very wrong....
    > >
    > >> This machine is not in production yet so I can still make changes to
    > >> the configuration. The current block size is 16384 and the stripe size
    > >> 419k. I assume it would be a good idea to change that to for example
    > >> 491,520?
    > >
    > >
    > > ...or try a few stripe sizes, such as 64K or 128K.

    FWIW - The man page suggests avoiding powers of 2 and a minimum 128K strip
    size.

    Cheers,

    Drew

    > Thanks for your comments, I felt it was a good idea just to check before
    > we start to use this piece seriously then I will not be able to touch it
    > for changing configuration. Will try different stripe sizes as per your
    > advice.
    >
    > /per olof
    >
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