Date: Fri, 20 Jul 2007 23:26:04 +0200 From: Michael Worobcuk <mail@michaelworobcuk.de> To: Tom Judge <tom@tomjudge.com> Cc: freebsd-stable@freebsd.org Subject: Re: Dell PERC5/i SAS5/5IR - RAID monitoring Message-ID: <4837D0B1-93C2-4476-8D91-7D2586722458@michaelworobcuk.de> In-Reply-To: <46A134AB.2050803@tomjudge.com> References: <4CC93356-890C-43DF-A905-0B9ABC990223@michaelworobcuk.de> <469D5061.8060306@tomjudge.com> <2F1F8117-86EF-49B4-AB4E-8A656727570A@michaelworobcuk.de> <469DE961.9060608@tomjudge.com> <932C632C-A89B-427F-92EC-71B351D66D17@michaelworobcuk.de> <46A134AB.2050803@tomjudge.com>
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Am 21.07.2007 um 00:18 schrieb Tom Judge: > Michael Worobcuk wrote: >>> Tom Judge wrote: >>> >>> As for performance issues with the SAS5/i, there is a problem in >>> the controller. A work arround was created by Scott Long which >>> created a sysctl that could be set to cause the controller to >>> turn on the on drive write cache's. These changes where commited >>> to RELENG_6 on 2007-06-05 21:32:57 UTC. >>> >>> >>> ... >>> >>>> >>>> Here is the original commit log: >>>> >>>> scottl 2007-06-03 23:13:05 UTC >>>> >>>> FreeBSD src repository >>>> >>>> Modified files: >>>> sys/dev/mpt mpt.c mpt.h mpt_cam.c >>>> Log: >>>> mpt.c: >>>> mpt.h: >>>> Add support for reading extended configuration pages. >>>> mpt_cam.c: >>>> Do a top level topology scan on the SAS controller. >>>> If any SATA device are discovered in this scan, send a >>>> passthrough FIS to set the write cache. This is controllable >>>> through the following tunable at boot: >>>> >>>> hw.mpt.enable_sata_wc: >>>> -1 = Do not configure, use the controller default >>>> 0 = Disable the write cache >>>> 1 = Enable the write cache >>>> >>>> The default is -1. This tunable is just a hack and >>>> may be >>>> deprecated in the future. >>> >> I set mpt.enable_sata_wc to 1, as hw.mpt.enable_sata_wc is, AFAIK >> not tunable in mpt_cam.c. This did not take any effect to the >> performance. Is there anything else to change ? > > Not that I know of, do you have SAS or SATA disks attached to the > controller? yes, SAS.
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