Date: Tue, 17 Apr 2007 12:52:30 +0100 From: Tom Judge <tom@tomjudge.com> To: Richard Tector <richardtector@thekeelecentre.com> Cc: freebsd-stable@freebsd.org, Ivan Voras <ivoras@fer.hr> Subject: Re: Dell SAS5 Performance Issue Message-ID: <4624B4FE.1070402@tomjudge.com> In-Reply-To: <46095CA9.7060701@thekeelecentre.com> References: <460959E8.207@thekeelecentre.com> <eubm0p$bo7$1@sea.gmane.org> <46095CA9.7060701@thekeelecentre.com>
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Richard Tector wrote: > Ivan Voras wrote: >> Richard Tector 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. >>> >> >> You looked in the controller's BIOS, not motherboard's, right? > Indeed I did. >> There should be at least a "write through" vs "write back" switch... > Correct, there should be options, but there aren't. The controller BIOS > has very few options at all in fact. > >> No, but can you post the relevant bits for the controller from dmesg? >> > Sure: > > mpt0: <LSILogic SAS/SATA Adapter> port 0xec00-0xecff mem > 0xfe9fc000-0xfe9fffff,0xfe9e0000-0xfe9effff irq 16 at device 8.0 on pci2 > mpt0: [GIANT-LOCKED] > mpt0: MPI Version=1.5.12.0 > mpt0: mpt_cam_event: 0x16 > mpt0: Unhandled Event Notify Frame. Event 0x16 (ACK not required). > mpt0: mpt_cam_event: 0x12 > mpt0: Unhandled Event Notify Frame. Event 0x12 (ACK not required). > mpt0: mpt_cam_event: 0x12 > mpt0: Unhandled Event Notify Frame. Event 0x12 (ACK not required). > mpt0: mpt_cam_event: 0x16 > mpt0: Unhandled Event Notify Frame. Event 0x16 (ACK not required). > [...snip...] > da0 at mpt0 bus 0 target 0 lun 0 > da0: <Dell VIRTUAL DISK 1028> Fixed Direct Access SCSI-5 device > da0: 300.000MB/s transfers, Tagged Queueing Enabled > da0: 305175MB (624998400 512 byte sectors: 255H 63S/T 38904C) I have just stumbled across this problem on 4 PE860's and 2 PE840's. I have been through the BIOS of the card and found no information about caching in any of the menus. I then decided to take the card out and could not see any place to attach a cache battery backup unit, I could also not see any ram chips on the card. Is there any news on the performance of this card? Tomhelp
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