Date: Mon, 21 Aug 2006 11:21:57 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Chris Knipe <savage@savage.za.org> Cc: freebsd-questions@freebsd.org Subject: Re: sluggish disk performance. Message-ID: <20060821162156.GB45306@dan.emsphone.com> In-Reply-To: <000701c6c539$bbb33710$0a01a8c0@superman> References: <000701c6c539$bbb33710$0a01a8c0@superman>
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In the last episode (Aug 21), Chris Knipe said: > Disks ad0 ofod intrn > KB/t 16.83 %slo-z 35456 buf > tps 103 4 tfree 414 dirtybuf > MB/s 1.70 20988 desiredvnodes > % busy 98 5247 numvnodes > 4223 freevnodes > > Got 1 ATA100 Seagate 120GB disk in there at the moment.... 1.7MB/s at > 98% busy? Surely, that figure is WAY low??? I'd expect atleast > about 10MB/s on ATA100. That number's about right for random I/O and small blocksizes, which is what the KB/t field shows. If you were doing sequential I/O, the KB/t field would be at or near 128. Are you also running a "du", "cvs update", or other command likely to be doing random disk accesses? -- Dan Nelson dnelson@allantgroup.com
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