[SUMMARY] : Veritas Defragmentation best practices

From: Filipe Litaiff (filipe_litaiff_at_optiglobe.com.br)
Date: 04/07/04

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    Date: Wed, 7 Apr 2004 12:21:58 -0300
To: <sunmanagers@sunmanagers.org>

    Hi folks, sorry for the late summary.

    Special thanks to

    Jose Luiz
    Darren Dunham
    Roy Erickson

    Conclusions:

    - The consensus is that regardless possibly some I/O issues, the process is
    pretty harmless, as it uses the intent log on the final steps.

    - I have shceduled the defrags on allfilesystems (200 Gb) and in some cases,
    It took all my backup window (9 hours!) , where the applications are
    unavailable, and eventually got through work hours. There is a feature what
    limits the amount of time the defrag can run, probably I4ll use it.

    - I have analyzed the IO on the hours the reorganization runned, and figured
    that as expected, the I/O overhead is measurable but doesn4t seem to be
    significant. Anyway, I choosed to schedule in a way tha it will never colide
    to full backups, when IO is demanded heavily.

    - It souds pretty on the manuals, but some feedback I had is that the
    improvement it could deliver is hard to measure, or even non significant in
    most cases. I undestood that it is caused by the very robustness and
    flexibility of the VXFS itself, thanks to the good job Veritas did on its
    filesystem. Anyway, I4ll try to figure out if someone here perceived
    enhancements on performance.

    Regards,

    Filipe Litaiff
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