# [OmniOS-discuss] ZIL partition size

Eric Sproul esproul at omniti.com
Wed Apr 24 12:30:39 EDT 2013

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    On Wed, Apr 24, 2013 at 12:11 PM, Fábio Rabelo
    <fabio at fabiorabelo.wiki.br> wrote:
    > Hi to all ... and thanks in advance ...
    >
    > I believe it is a simple question, there are a recommended and/or minimum
    > size to a disk/partition to store ZIL logs ?!?

    Google is your friend.

    http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide#Separate_Log_Devices

    "For a target throughput of X MB/sec and given that ZFS pushes
    transaction groups every 5 seconds (and have 2 outstanding), we also
    expect the ZIL to not grow beyond X MB/sec * 10 sec. So to service
    100MB/sec of synchronous writes, 1 GB of log device should be
    sufficient."

    So it depends highly on the amount of sync writes you expect in your workload.

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