Date: Tue, 27 Mar 2007 20:18:40 -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: <7579f7fb0703272018i68983d5cvb9fe84c79cebd473@mail.gmail.com> In-Reply-To: <46095CE5.5080600@thekeelecentre.com> References: <460959E8.207@thekeelecentre.com> <7579f7fb0703271102q1a866897x2d63a86e72895125@mail.gmail.com> <46095CE5.5080600@thekeelecentre.com>
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not at the momeny- it's really that I won't have time until april On 3/27/07, Richard Tector <richardtector@thekeelecentre.com> wrote: > Matthew Jacob wrote: > > 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" > >> > Thank you for the quick reply. > Is there any information I could obtain that would be of use to you in > tracking this one down? > > Regards, > > Richard >
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