# [OmniOS-discuss] How to get NFS read & write latency in OmniOS r151016

Richard Elling richard.elling at richardelling.com
Wed Dec 23 03:49:05 UTC 2015

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    > On Dec 22, 2015, at 4:44 PM, 張峻宇 <jerry1209 at cht.com.tw> wrote:
    >
    > Hi all,
    >       According to the release note of OmniOS r151016, we could get “IOPS, bandwidth, and latency kstats for NFS server”
    >
    >       there is lots of information showing when I use enter command #kstat,
    >       I want to get the “nfs read & write latency for NFS server”
    >
    >       Q1 : Is the ‘nfs:0:rfsprocio_v4_write:wtime’ & ‘nfs:0:rfsprocio_v4_read:wtime’ meant write & read latency ?

    No, wtime is the wait queue occupancy (%wait in iostat -x)
    A good reference is the man page for kstat(3kstat)
    	man -s 3kstat kstat

    Hopefully, the information there will answer your Q2.
     -- richard

    >       Q2 : I mounted the nfs share directory, and write lots file to it, the number of ‘nfs:0:rfsprocio_v4_write:wtime’ & ‘nfs:0:rfsprocio_v4_read:wtime’ still zero. Why ?
    >
    >       #kstat –p –m nfs –n rfsprocio_v4_write
    >         nfs:0:rfsprocio_v4_write:class        rfsprocio_v4
    > nfs:0:rfsprocio_v4_write:crtime     50.833043074
    > nfs:0:rfsprocio_v4_write:nread      3932160
    > nfs:0:rfsprocio_v4_write:nwritten  5374607360
    > nfs:0:rfsprocio_v4_write:rcnt 0
    > nfs:0:rfsprocio_v4_write:reads       163840
    > nfs:0:rfsprocio_v4_write:rlastupdate     12048225488385
    > nfs:0:rfsprocio_v4_write:rlentime  33429565743
    > nfs:0:rfsprocio_v4_write:rtime       23992279289
    > nfs:0:rfsprocio_v4_write:snaptime 269635.483575440
    > nfs:0:rfsprocio_v4_write:wcnt        0
    > nfs:0:rfsprocio_v4_write:wlastupdate    0
    > nfs:0:rfsprocio_v4_write:wlentime 0
    > nfs:0:rfsprocio_v4_write:writes      163840            / number of writes /
    > nfs:0:rfsprocio_v4_write:wtime     0                      / wait queue - time spent waiting /
    >
    >         #kstat –p –m nfs –n rfsprocio_v4_read
    >         nfs:0:rfsprocio_v4_read:class rfsprocio_v4
    > nfs:0:rfsprocio_v4_read:crtime      50.833003263
    > nfs:0:rfsprocio_v4_read:nread       0
    > nfs:0:rfsprocio_v4_read:nwritten   0
    > nfs:0:rfsprocio_v4_read:rcnt  0
    > nfs:0:rfsprocio_v4_read:reads        0
    > nfs:0:rfsprocio_v4_read:rlastupdate      0
    > nfs:0:rfsprocio_v4_read:rlentime   0
    > nfs:0:rfsprocio_v4_read:rtime        0
    > nfs:0:rfsprocio_v4_read:snaptime  269635.483080962
    > nfs:0:rfsprocio_v4_read:wcnt 0
    > nfs:0:rfsprocio_v4_read:wlastupdate     0
    > nfs:0:rfsprocio_v4_read:wlentime 0
    > nfs:0:rfsprocio_v4_read:writes       0
    > nfs:0:rfsprocio_v4_read:wtime      0
    >
    >
    >
    > Best regards,
    > ---------------------------------------------
    > 張峻宇
    > 中華電信研究院雲端運算研究所
    > TEL: 03-4245663
    >
    >
    >
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