Date: Tue, 5 Aug 2003 15:47:42 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Jason Lieurance <jason@vipersystems.biz> Cc: freebsd-questions@freebsd.org Subject: Re: Hard drive performance question Message-ID: <20030805204742.GB88387@dan.emsphone.com> In-Reply-To: <2948.192.168.1.150.1060116006.squirrel@www.vipersystems.biz> References: <2948.192.168.1.150.1060116006.squirrel@www.vipersystems.biz>
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In the last episode (Aug 05), Jason Lieurance said: > I have FreeBSD 4.7 server running a qmail-imap-squirrelmail email > server and a apache 1.3.27 web server hosting 6 virtual domains that > don't get a lot of traffic. > > Hardware is: > > P3 933MHz CPU > 512 DDR ram > Fujitsu MAN3184MP 18.2 GB U160 10K rpm 8MB buffer 2.9 ms access Hard drive > Adaptec 29160LP U160 SCSI controller > > When I run vmstat, I get: > > procs memory page disks faults CPU > r b w avm fre flt re pi po fr sr da0 md0 in sy cs us sy id > 0 14 0 184016 40900 26 0 0 0 31 0 0 0 245 839 28 1 1 98 > 0 14 0 86940 40896 7 0 0 0 15 0 12 0 242 115 21 0 0 99 > 0 14 0 81460 40896 6 0 0 0 12 0 10 0 239 98 18 0 0 100 > 0 14 0 85172 40896 7 0 0 0 15 0 14 0 243 116 21 0 1 99 > 0 14 0 190092 40896 32 0 0 0 37 0 10 0 250 220 35 0 0 100 > > I've read this is a disk access problem where process are waiting on > the disk. As you can see this is a constant but I thought the disk > system I have was sufficient. Any thoughts, analysis, or other is > appreciated, thanks. I see only 10-15 I/Os per second on your disk, which would overload a floppy drive but nothing else. What problem specifically are you trying to fix? -- Dan Nelson dnelson@allantgroup.com
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