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

[Richard Elling]

> 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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