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.
# 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?
Kind regards
Miroslav Lachman
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