Miroslav Lachman wrote this message on Sun, Aug 19, 2018 at 02:29
+0200:> I upgraded one of our servers from 10.4 to 11.2 and scripts using output
> of "iostat -x" are not working anymore.
> A checked the output of iostat and it is different.
Looks like this was changed in r277566[1] by will. I've cc'd him.
There
is no documentation change associated w/ this change.
[1] https://svnweb.freebsd.org/base?view=revision&revision=277566
> # on 10.4
>
> # iostat -w 5 -c 2 -x ada0 ada1
> extended device statistics
> device r/s w/s kr/s kw/s qlen svc_t %b
> ada0 51.5 28.3 1381.4 539.7 0 9.7 33
> ada1 51.4 28.2 1381.5 539.7 0 10.1 34
> extended device statistics
> device r/s w/s kr/s kw/s qlen svc_t %b
> ada0 0.2 6.4 2.4 136.5 0 2.9 2
> ada1 0.0 5.8 0.0 136.5 0 3.4 2
>
>
> # on 11.2
>
> # iostat -w 5 -c 2 -x ada0 ada1
> extended device statistics
> device r/s w/s kr/s kw/s ms/r ms/w ms/o ms/t qlen %b
> ada0 6 24 35.9 697.9 2 1 77 3 0 6
> ada1 6 23 34.9 697.9 2 1 77 3 0 6
> extended device statistics
> device r/s w/s kr/s kw/s ms/r ms/w ms/o ms/t qlen %b
> ada0 0 21 0.0 776.6 0 0 96 2 0 5
> ada1 0 21 0.0 776.6 0 0 100 2 0 5
>
> But I cannot find the explanation of new columns. The manpage seems the
> same for 10.4 and 11.2
>
> The extended iostat device display, with the -x flag specified,
> shows the following statistics:
>
> r/s read operations per second
> w/s write operations per second
> kr/s kilobytes read per second
> kw/s kilobytes write per second
> qlen transactions queue length
> svc_t average duration of transactions, in milliseconds
> %b % of time the device had one or more outstanding transac-
> tions
>
> But there is no svc_t column anymore and there are ms/r ms/w ms/o and
> ms/t columns not mentioned in man page.
>
> Is it a documentation bug?
>
> Is ms/t the same what was previously known as svc_t?
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