# [OmniOS-discuss] zfs diskusage

Dan McDonald danmcd at omniti.com
Thu May 15 15:08:59 UTC 2014

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    On May 15, 2014, at 8:05 AM, Tobias Oetiker <tobi at oetiker.ch> wrote:

    > Today we were out of diskspace on one of our pools ... a few removed
    > snapshots later all is fine, except that I find that I don't realy
    > understand the numbers ... can anyone elighten me?
    >
    > # zpool list fast
    > NAME   SIZE  ALLOC   FREE  EXPANDSZ    CAP  DEDUP  HEALTH  ALTROOT
    > fast  4.34T  1.74T  2.61T         -    39%  1.22x  ONLINE  -
    >
    > # zfs list fast
    > NAME   USED  AVAIL  REFER  MOUNTPOINT
    > fast  2.59T   716G  78.5K  /fast
    >
    > Why does the 'zpool list' claim that 2.61T is free (61%)
    > while 'zfs list' sees 716G free (27%)
    >
    > I know there is raidz2 and compression so the numbers  don't match
    > up, but I don't understand why the ratio is so different between
    > the two.

    Richard Elling addressed something similar on a different thread:

    http://lists.omniti.com/pipermail/omnios-discuss/2014-May/002609.html

    You're running raidz2, and that's likely why you're seeing the discrepency between zpool and zfs.

    Try Richard's advice of running "zfs list -o space" for the breakdown.

    Dan

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