Date: Tue, 27 Mar 2007 11:02:07 -0700 From: "Matthew Jacob" <lydianconcepts@gmail.com> To: "Richard Tector" <richardtector@thekeelecentre.com> Cc: freebsd-stable@freebsd.org Subject: Re: Dell SAS5 Performance Issue Message-ID: <7579f7fb0703271102q1a866897x2d63a86e72895125@mail.gmail.com> In-Reply-To: <460959E8.207@thekeelecentre.com> References: <460959E8.207@thekeelecentre.com>
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It's been seen before but the fix isn't know yet. On 3/27/07, Richard Tector <richardtector@thekeelecentre.com> wrote: > I'm suffering from very slow write performance on a Dell PowerEdge 860 > with the SAS5/IR controller (mpt driver) running either 6.2-RELEASE or > 6.2-STABLE with sources from yesterday. The controller hosts 2 Western > Digital 320GB SATA disks in a RAID1 configuration. > Reads approach 65MB/s however writes appear extremely slow, in the > region of 6-7MB/s with a dd and a blocksize of 1MB all the way down to > about 300KB/s while extracting a ports snapshot. > > It was suggested to me that perhaps write caching has been disabled on > the controller however no options exist within the BIOS configuration to > view/adjust *any* caching options. > > Has anyone else experienced this issue? If so how did they resolve it? > Also, is there any way to toggle the caching settings from FreeBSD? > > Regards, > > Richard Tector > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" >
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