Date: Thu, 29 Jan 2009 10:48:28 -0500 From: "Peter C. Lai" <peter@simons-rock.edu> To: Richard Tector <richardtector@thekeelecentre.com> Cc: Charles Sprickman <spork@bway.net>, freebsd-stable@freebsd.org Subject: Re: 7.1, mpt and slow writes Message-ID: <20090129154828.GC63236@cesium.hyperfine.info> In-Reply-To: <49819672.1090208@thekeelecentre.com> References: <alpine.OSX.2.00.0901290351250.37588@toasty.nat.fasttrackmonkey.com> <49819672.1090208@thekeelecentre.com>
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On 2009-01-29 11:43:46AM +0000, Richard Tector wrote: > Charles Sprickman wrote: >> Hello, >> >> I think this needs a few more eyes: >> >> http://lists.freebsd.org/pipermail/freebsd-scsi/2009-January/003782.html >> >> In short, writes are slow, likely do to the write-cache being enabled on >> the controller. The sysctl used in 6.x to turn the cache off don't seem >> to be in 7.x. > I am guessing this is only related to SATA drives on SAS controllers? The only mpt hardware I have is LSILogic 1030 Ultra4 and it writes sustained 40MB/s to my LTO-2 drives out of the box without any tweaking. -- =========================================================== Peter C. Lai | Bard College at Simon's Rock Systems Administrator | 84 Alford Rd. Information Technology Svcs. | Gt. Barrington, MA 01230 USA peter AT simons-rock.edu | (413) 528-7428 ===========================================================
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