# [OmniOS-discuss] ZFS and Usage-creep

Scott LeFevre slefevre at indy.rr.com
Thu May 15 14:16:43 UTC 2014

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    Tim,

    I'm interested if you sorted out the answer to your question from
    Richard's response?
    I've seen this situation as well and I'm curious for clear answer.

    Cheers,
    --
    Scott LeFevre

    On Mon, 2014-05-12 at 16:41 -0400, Tim Brown wrote:

    > I have a question about ZFS usage and how to predictability allocate
    > space.  I have scoured the web trying to get a good answer, but have
    > yet to find one.
    >
    > I am advertising 2TB datastores to our VMware cluster over fiber
    > channel using comstar.  I use this command to create the dataset.
    >
    > zfs create -V 2047g vmpool01/datastores/ds01
    >
    > It all works great but some of my datasets are using far more that the
    > 2047g(more than double in one case).  Here are some examples:
    >
    > zfs list
    > NAME                           USED  AVAIL  REFER  MOUNTPOINT
    > ...
    > vmpool01                      27.4T  20.7T   469K  /vmpool01
    > vmpool01/datastores           27.4T  20.7T   384K  /vmpool01/datastores
    > vmpool01/datastores/ds01      3.10T  20.7T  3.10T  -
    > vmpool01/datastores/ds02      2.06T  21.4T  1.34T  -
    > vmpool01/datastores/ds03      2.69T  20.7T  2.69T  -
    > vmpool01/datastores/ds04      2.49T  20.7T  2.49T  -
    > vmpool01/datastores/ds05      3.69T  20.7T  3.69T  -
    > vmpool01/datastores/ds06      4.67T  20.7T  4.67T  -
    > vmpool01/datastores/ds07      2.47T  20.7T  2.47T  -
    > vmpool01/datastores/ds08      2.06T  20.8T  1.92T  -
    > ...
    >
    > Can someone explain this to me or is there a document somewhere that
    > can tell me how to predict the usage?  Thanks.
    >
    > - Tim
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