Date: Mon, 21 Aug 2006 18:42:34 +0200 From: "Chris Knipe" <savage@savage.za.org> To: "Dan Nelson" <dnelson@allantgroup.com> Cc: freebsd-questions@freebsd.org Subject: Re: sluggish disk performance. Message-ID: <003701c6c540$d0744f20$0a01a8c0@superman> References: <000701c6c539$bbb33710$0a01a8c0@superman> <20060821162156.GB45306@dan.emsphone.com>
next in thread | previous in thread | raw e-mail | index | archive | help
> In the last episode (Aug 21), Chris Knipe said: >> Disks ad0 ofod intrn >> KB/t 16.83 %slo-z 35456 buf >> tps 103 4 tfree 414 dirtybuf >> MB/s 1.70 20988 desiredvnodes >> % busy 98 5247 numvnodes >> 4223 freevnodes >> >> Got 1 ATA100 Seagate 120GB disk in there at the moment.... 1.7MB/s at >> 98% busy? Surely, that figure is WAY low??? I'd expect atleast >> about 10MB/s on ATA100. > > That number's about right for random I/O and small blocksizes, which is > what the KB/t field shows. If you were doing sequential I/O, the KB/t > field would be at or near 128. Are you also running a "du", "cvs > update", or other command likely to be doing random disk accesses? ALTER TABLE on a 200MB mySQL table? I guess its time for a dedicated disk then.... -- C
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?003701c6c540$d0744f20$0a01a8c0>