[OpenIndiana-discuss] iostat

[Jonathan Adams]

do you have "Enterprise" grade disks in your machine?  We saw a lot of %b
and %w associated with "Consumer" Seagate disks ... not all the time, and
not for over a year in production, but once it started happening across
multiple servers we cottoned on pretty quickly.


On 10 October 2013 21:39, jason matthews <jason at broken.net> wrote:

>
> I am not sure when reporting zpool stats was introduced into iostat but i
> love it. however, i am not sure what to make of it.
>
> For instance, what does a wsvc time of 20 seconds tell me? seems like my
> queue is too big but that is not reflected in individual device statistics.
> in the case of zpools, is this some sort of reflection on transaction
> groups?
>
> can anyone explain why i see such large time associated with zpool in the
> iostat output?
>
> thanks,
> j.
>
>                     extended device statistics
>     r/s    w/s        Mr/s   Mw/s    wait     actv  wsvc_t asvc_t  %w  %b
>   device
>     0.0 3958.7    0.0  300.7       0.1     18.8   0.0       4.7        0
> 153   c3
>     0.0   11.8       0.0    0.1         0.0      0.0    0.0       0.6
>     0       0    c3t55CD2E400012A66Cd0
>     0.0    0.0        0.0    0.0         0.0      0.0    0.0       0.0
>     0       0    c3t55CD2E400012B753d0
>     0.0 2679.7    0.0  149.1       0.1      9.9    0.0       3.7        5
>     80    c3t50015178F36579E8d0
>     0.0 1267.2    0.0  151.5       0.0      8.8    0.0       7.0        3
>     73    c3t50015178F3657B74d0
>     0.0    0.0        0.0    0.0          0.0      0.0    0.0       0.0
>      0       0    c3t50015178F3657AECd0
>     0.0    0.0        0.0    0.0         0.0       0.0    0.0       0.0
>      0       0    c3t50015178F36579E1d0
>     0.0    0.0        0.0    0.0         0.0       0.0    0.0       0.0
>      0       0    c3t50015178F3657B85d0
>     0.0    0.0        0.0    0.0         0.0       0.0    0.0       0.0
>      0       0    c3t50015178F36579BAd0
>     0.0    0.0        0.0    0.0         0.0       0.0    0.0       0.0
>      0       0    c3t50015178F3657A05d0
>     0.0    0.0        0.0    0.0         0.0       0.0    0.0       0.0
>      0       0    c3t50015178F36579FEd0
>     0.0    0.0        0.0    0.0         0.0       0.0    0.0       0.0
>      0       0    c5
>     0.0    0.0        0.0    0.0         0.0       0.0    0.0       0.0
>      0       0    c5t4d0
>     0.0 3946.1    0.0  300.6  80582.9 26.2 20421.0  6.6  88    89 data
>     0.0   11.6    0.0    0.1  0.0  0.0    1.1    0.8   0   0 rpool
>
>
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