Date: Tue, 7 Oct 2003 08:43:58 -0700 From: Randy Bush <randy@psg.com> To: Don Lewis <truckman@FreeBSD.org> Cc: freebsd-stable@FreeBSD.org Subject: Re: dump faster from remote than from local Message-ID: <E1A6u0G-000JkG-2A@roam.psg.com> References: <E1A6EDt-000GST-SF@ran.psg.com> <200310051955.h95JtlN1049840@gw.catspoiler.org>
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>> dump from B->A i.e. from a system on local ether >> >> DUMP: DUMP: 2082890 tape blocks on 1 volume >> DUMP: finished in 478 seconds, throughput 4357 KBytes/sec >> ^^^^^^^^^^^^^^^ >> and a local dump on A >> >> DUMP: DUMP: 3560987 tape blocks on 1 volume >> DUMP: finished in 3694 seconds, throughput 963 KBytes/sec >> ^^^^^^^^^^^^^^ >> why is local slower than remote? > > What are you dumping to on A? sorry. both dumping to a separate dump drive on sys A. > If you are dumping to a file on the same spindle, you spend a lot > more time doing long seeks. Is there other I/O occuring on the > same spindle as the filesystem that you are dumping on A? nope > Could the file system on B have a small number of large files while A > has a large number of small files? nope. both /usr on freebsd systems > What results do you get if you dump each file system to /dev/null > on the local machine? good question randy
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