Date: Sat, 30 Jul 2005 03:29:27 -0700 From: Julian Elischer <julian@elischer.org> To: Poul-Henning Kamp <phk@haven.freebsd.dk> Cc: FreeBSD Current <freebsd-current@freebsd.org> Subject: Re: Apparent strange disk behaviour in 6.0 Message-ID: <42EB5687.2070400@elischer.org> In-Reply-To: <87711.1122534245@phk.freebsd.dk> References: <87711.1122534245@phk.freebsd.dk>
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Poul-Henning Kamp wrote:
> In message <42E88135.30603@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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