Apparent strange disk behaviour in 6.0
Julian Elischer
julian at elischer.org
Sat Jul 30 10:29:34 GMT 2005
Poul-Henning Kamp wrote:
> In message <42E88135.30603 at elischer.org>, Julian Elischer writes:
>
> Please use gstat and look at the service times instead of the
> busy percentage.
>
>
The snapshot below is typical when doing tar from one drive to another..
(tar c -C /disk1 f- .|tar x -C /disk2 -f - )
dT: 1.052 flag_I 1000000us sizeof 240 i -1
L(q) ops/s r/s kBps ms/r w/s kBps ms/w d/s kBps ms/d
%busy Name
0 405 405 1057 0.2 0 0 0.0 0 0 0.0
9.8| ad0
0 405 405 1057 0.3 0 0 0.0 0 0 0.0
11.0| ad0s2
0 866 3 46 0.4 863 8459 0.7 0 0 0.0
63.8| da0
25 866 3 46 0.5 863 8459 0.8 0 0 0.0
66.1| da0s1
0 405 405 1057 0.3 0 0 0.0 0 0 0.0
12.1| ad0s2f
195 866 3 46 0.5 863 8459 0.8 0 0 0.0
68.1| da0s1d
even though the process should be disk limitted neither of the disks is anywhere
near 100%.
puting 'team' between the two copies of tar (as a fifo)
doesn't change the numbers.
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