Dell SAS5 Performance Issue

[Richard Tector]

Matthew Jacob wrote:
> On 3/27/07, Richard Tector <richardtector at 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 at 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,

Richard