# [OmniOS-discuss] Using zpool iostat

Alexandre NEY aney at ivision.fr
Wed Aug 21 19:00:20 UTC 2013

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    Alright then !

    Thank you for the information, I wasn't aware of this first output thing and couldn't find anything in the man page referring to that. So everything is working as intended. Do you know if there is a way to bypass that first output to directly get the *actual* statistics and not *since boot* ?

    Thanks !

    -----Message d'origine-----
    De : Eric Sproul [mailto:esproul at omniti.com]
    Envoyé : mercredi 21 août 2013 16:09
    À : Alexandre NEY
    Cc : omnios-discuss at lists.omniti.com
    Objet : Re: [OmniOS-discuss] Using zpool iostat

    On Wed, Aug 21, 2013 at 9:43 AM, Alexandre NEY <aney at ivision.fr> wrote:
    > All looks good except  that there is no activity on this pool. If i run the same command over and over again the exact same statistics will appear.
    >
    > If i run
    >
    > root at ivi-zfs01:~# zpool iostat 1
    >                capacity     operations    bandwidth
    > pool        alloc   free   read  write   read  write
    > ----------  -----  -----  -----  -----  -----  -----
    > POOL01      25.8T  32.2T    292    567  32.1M  25.8M
    > rpool       9.02G   102G      3      6  20.2K  41.4K
    > ----------  -----  -----  -----  -----  -----  -----
    > POOL01      25.8T  32.2T      0      0      0      0
    > rpool       9.02G   102G      0      0      0      0
    > ----------  -----  -----  -----  -----  -----  -----
    >
    > The second output reflects reality (no activity)

    Like iostat and similar commands, the first line or set of output represents an average since boot, with the following lines/sets showing the numbers for that interval.  Obviously the first question is, *should* there be activity to the pool?  ZFS bundles up async writes and flushes them every 5 seconds, or more often if there is heavy write traffic.  If you watch the output for 10-15 seconds you should see activity, assuming something is reading and/or writing on that pool.

    Eric

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