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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