Date: Tue, 31 Oct 2006 13:31:25 +0100 From: Fredrik Widlund <fredrik.widlund@qbrick.com> To: Ivan Voras <ivoras@fer.hr> Cc: freebsd-stable@freebsd.org Subject: Re: SAS Raid - mfi driver Message-ID: <4547421D.2010206@qbrick.com> In-Reply-To: <45471ACC.2030604@fer.hr> References: <45470D95.5020801@qbrick.com> <ei7448$4rs$1@sea.gmane.org> <454718DD.8060108@qbrick.com> <45471ACC.2030604@fer.hr>
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256MB cache, no BBU. Tried a lot of different combinations of settings. fbsd 6.2pre writes 220MB/s with raid-0 If I boot windows server 2003 instead, it writes at around 180MB/s with raid-5 (same configs). With fbsd6.2pre, I get the "best" performance with BadBBU/direct io/disabled cache and 8 drives, maybe around 50 MB/s, however I get a zig-zag performance pattern, with the adapter running at 500% (gstat) utilization one second, then down to 0% for maybe 3 seconds, back, etc. Fredrik Ivan Voras wrote: > Fredrik Widlund wrote: >> Ivan Voras wrote: >>> Several: >>> >>> - are there cache differences between the controllers (amount of >>> memory, cache policy)? >> Default settings on both. > > Maybe you should check what the defaults are :) Especially the amount > of memory and is there a battery to back the cache. > >>> - 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 > > This is bad :( The difference between p0 and raw device might indicate > a stripe size misalignment, but the values are too low in any case. > > > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org"
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