Date: Tue, 27 Mar 2007 18:52:40 +0100 From: Richard Tector <richardtector@thekeelecentre.com> To: freebsd-stable@freebsd.org Subject: Dell SAS5 Performance Issue Message-ID: <460959E8.207@thekeelecentre.com>
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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
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