Date: Wed, 4 Oct 2006 09:12:48 -0400 From: "Gibson, Jasen \(GE Indust, ConsInd, consultant\)" <jasen.gibson@ge.com> To: <freebsd-amd64@freebsd.org> Subject: Re: suggestions for SATA RAID cards Message-ID: <888F5D88060A214ABEFED0011CF18662011FF937@LOUMLVEM03.e2k.ad.ge.com>
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-----Original Message----- Date: Mon, 2 Oct 2006 18:02:30 +0100 (BST) From: Chris Hedley <cbh-freebsd-current@groups.chrishedley.com> Subject: Re: suggestions for SATA RAID cards On Tue, 29 Aug 2006, Barkley Vowk wrote: >> Little late to the game on this post... >Even later here, but I thought I may as well throw in my tuppence worth = >since I'm going through this again at the moment. > >I have an Adaptec 2410SA coupled to 4 250GB discs. I strongly = recommend=20 >avoiding it: terrible performance, on RAID5 or 10 partitions I get = around=20 >30-40 MB/s on reads and between 3 and 6 MB/s on writes. Performance is = >probably better if using write back caching on the card and discs, but=20 >nobody here will be doing that, right? Its other main "issue" is more=20 >timeouts than you can shake a stick at under load, and unless you can = kill=20 >off the offending process, the reset button's the only way out. I = tested=20 >its ability to rebuild its sets after simulating a disc failure by=20 >removing one of the hot-swap trays, which it repaired without any = issues=20 >other than the time it took; I eventually got fed up with hanging = around=20 >for it to finish, but it was somewhere between 6 and 12 hours. > >I suspect I'll go for the Areca this time around, but I think I'll=20 >approach it with rather more caution as I don't want to find myself = with=20 >another lemon like the 2410SA! > >Chris. I'm using the same card, Chris. My setup is a Tyan S2881 dual Opteron = board and 4 WD RE2 400GB drives in a RAID 5. My speed varies greatly, depending how large a file I'm accessing (which = is an expected result, I think). Files less than a GB, write at about = around 130MB/s, read between 400-600MB/s (have not ruled out whether = cache is helping boost this number). Files over 10GB this drops to a = read speed of 40GB, like you've seen. But the write speed will stay up = at around 90! It's very odd. I've been seeing similar posts to this = for a while now, concerning Highpoint, 3ware, Qlogic, and Adaptec cards = and freebsd 5.4+; it almost makes me wonder if there's not another = factor here, drivers or something. I have not seen any of the timeouts you mention. Considering I'm = running a Mysql-driven forum off of this, Mysql should be hanging up = quite often if this were happening. I've just been using dd to come up with these numbers. Are there any = true disk benchmarking utils out there for BSD?=20
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