Date: Sun, 01 Apr 2007 16:23:13 +0100 From: Richard Tector <richardtector@thekeelecentre.com> To: Matthew Jacob <lydianconcepts@gmail.com> Cc: freebsd-stable@freebsd.org Subject: Re: Dell SAS5 Performance Issue Message-ID: <460FCE61.7090006@thekeelecentre.com> In-Reply-To: <7579f7fb0703272018i68983d5cvb9fe84c79cebd473@mail.gmail.com> References: <460959E8.207@thekeelecentre.com> <7579f7fb0703271102q1a866897x2d63a86e72895125@mail.gmail.com> <46095CE5.5080600@thekeelecentre.com> <7579f7fb0703272018i68983d5cvb9fe84c79cebd473@mail.gmail.com>
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Matthew Jacob wrote: > 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? >> A perhaps unrealted issue: I've noticed a large number of messages being produced by the mpt driver after boot occuring approximately every 90 seconds. Apr 1 15:51:43 moses kernel: mpt0: mpt_cam_event: 0x14 Apr 1 15:51:43 moses kernel: mpt0: Unhandled Event Notify Frame. Event 0x14 (ACK not required). Apr 1 15:53:19 moses kernel: mpt0: mpt_cam_event: 0x14 Apr 1 15:53:19 moses kernel: mpt0: Unhandled Event Notify Frame. Event 0x14 (ACK not required). Any thoughts anyone? Is there any way to find out what the events correspond to? Regards, Richardhome | help
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