Date: Thu, 30 Aug 2007 09:02:43 -0300 From: "Lutieri G." <lutierigbtrabalho@gmail.com> To: "Eric Anderson" <anderson@freebsd.org> Cc: FREEBSD - SCSI - LIST <freebsd-scsi@freebsd.org> Subject: Re: performance with LSI SAS 1064 Message-ID: <71d0ebb0708300502x632fe83bo617f84ca2008dc7d@mail.gmail.com> In-Reply-To: <46D63710.1020103@freebsd.org> References: <71d0ebb0708291245g79d2141fx73cc8a6e76875944@mail.gmail.com> <46D5E17F.3070403@samsco.org> <71d0ebb0708291416v17351c65u7ccc1b7bbe0271d2@mail.gmail.com> <46D5E5B1.207@samsco.org> <71d0ebb0708291506i49649a60l8006deafb20891ac@mail.gmail.com> <46D63710.1020103@freebsd.org>
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2007/8/30, Eric Anderson <anderson@freebsd.org>: > > I'm confused - you said in your first post you were getting 3MB/s, where > above you show something like 55MB/s. Sorry! using blogbench i got 3MB/s and 100% busy. Once is 100% busy i thinked that 3MB/s is the maximum speed. But i was wrong... > > You didn't say what kind of disks, or how many, the configuration, etc - > so it's hard to answer much. The 55MB/s seems pretty decent for many > hard drives in a sequential use state (which is what dd tests really). > SAS disks. Seagate, i don't know what is the right model of disks. Ok. If 55Mb/s is a decent speed i'm happy. I'm getting problems with squid cache and maybe should be a problem related with disks. But... i'm investigating and discharging problems. > Your errors before were probably caused because your queue depth is set > to 255 (or 256?) and the adapter can't do that many. You should use > camcontrol to reduce it, to maybe 32. See the camcontrol man page for > the right usage. It's something that needs setting on every boot, so a > startup file is a good place for it maybe. > Is there any way of get the right number to reduce?! > Eric -- Regards Lutieri G. B.
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