Date: Tue, 31 Oct 2006 10:27:56 +0000 From: Tom Judge <tom@tomjudge.com> To: Fredrik Widlund <fredrik.widlund@qbrick.com> Cc: freebsd-stable@freebsd.org, Ivan Voras <ivoras@fer.hr> Subject: Re: SAS Raid - mfi driver Message-ID: <4547252C.1000600@tomjudge.com> In-Reply-To: <454718DD.8060108@qbrick.com> References: <45470D95.5020801@qbrick.com> <ei7448$4rs$1@sea.gmane.org> <454718DD.8060108@qbrick.com>
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Fredrik Widlund wrote: > Ivan Voras wrote: > >> Several: >> >> - are there cache differences between the controllers (amount of >> memory, cache policy)? >> > Default settings on both. > >> - how does writing directly to the device (bypassing file system) >> compare? >> > Drives are four seagate 7200.10 400GB in a Raid-5 configuration. > > [/mnt/test (/dev/mfid0p1 mounted)] > read: 200MB/s > write: 15MB/s > > [/dev/mfid0p1] > read: 200MB/s > write: 8MB/s > > [/dev/mfid0] > read: 200MB/s > write: 10MB/s > > Kind regards, > Fredrik Widlund > > > Have you tried setting the write cache policy to write back rather than write thru? Tom
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