Date: Thu, 13 Nov 2003 08:23:27 -0500 From: Allen Briggs <briggs@wasabisystems.com> To: Gary Stanley <gary@outloud.org> Cc: Martin Blapp <mb@imp.ch> Subject: Re: Very bad FreeBSD SCSI RAID5 write speed performance Message-ID: <20031113132327.GF13029@canolog.ninthwonder.com> In-Reply-To: <6.0.0.22.2.20031113062949.028fbea0@localhost> References: <20031112172306.J4572@pooker.samsco.home> <20031113084355.P13503@cvs.imp.ch> <6.0.0.22.2.20031113062949.028fbea0@localhost>
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On Thu, Nov 13, 2003 at 06:38:53AM -0500, Gary Stanley wrote: > root@64:[/tmp/blah]>dd if=/dev/zero of=/tmp/blah/blah > 89472+0 records in > 89471+0 records out > 45809152 bytes transferred in 8.546312 secs (5360108 bytes/sec) I suspect you know this, but if you give a larger block size (bs=...), you should see better performance. Writing to a file on the filesystem not only brings up the softupdates question, but also your choices for block and fragment sizes. On a RAID, there's also the question of stripe size and how that's set with respect to the filesystem block and fragment sizes. -allen -- Allen Briggs briggs@wasabisystems.com Wasabi Systems, Inc. http://www.wasabisystems.com/
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