Date: Thu, 13 Nov 2003 10:24:51 -0500 From: Gary Stanley <gary@outloud.org> To: Allen Briggs <briggs@wasabisystems.com> Cc: freebsd-scsi@freebsd.org Subject: Re: Very bad FreeBSD SCSI RAID5 write speed performance Message-ID: <6.0.0.22.2.20031113101928.02b407b8@localhost> In-Reply-To: <20031113132327.GF13029@canolog.ninthwonder.com> References: <20031112172306.J4572@pooker.samsco.home> <20031113084355.P13503@cvs.imp.ch> <6.0.0.22.2.20031113062949.028fbea0@localhost> <20031113132327.GF13029@canolog.ninthwonder.com>
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Yeah, It was early in the morning, I was doing a bunch of IOS upgrades most of the night. :) >dd if=/dev/zero of=./test bs=128k count=2000 2000+0 records in 2000+0 records out 262144000 bytes transferred in 18.012217 secs (14553678 bytes/sec) Not bad. That's what I'm expecting. :) At 08:23 AM 11/13/2003, you wrote: >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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