# [OmniOS-discuss] zfs diskusage

Tobias Oetiker tobi at oetiker.ch
Fri May 16 09:07:52 UTC 2014

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    Hi Dan,

    Yesterday Dan McDonald wrote:

    > 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.

    well that looks nicer, but the numbers don't change ... the way it
    is, it seems very difficult to judge how much space is still
    available ... 61% free vs 27% free seems to be quite a big
    difference in my eyes.

    cheers
    tobi

    > Dan
    >
    >

    --
    Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
    www.oetiker.ch tobi at oetiker.ch +41 62 775 9902

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