Date: Wed, 4 Oct 2006 14:58:46 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Gibson, Jasen \(GE Indust, ConsInd, consultant\)" <jasen.gibson@ge.com>, <freebsd-amd64@freebsd.org> Subject: Re: suggestions for SATA RAID cards Message-ID: <035801c6e7bd$3aad9f10$b3db87d4@multiplay.co.uk> References: <888F5D88060A214ABEFED0011CF18662011FF937@LOUMLVEM03.e2k.ad.ge.com>
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Gibson, Jasen (GE Indust, ConsInd, consultant) wrote:
> 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).
Thats cached for sure.
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 had similar issues as you say with read being much slower than write
using a highpoint controller the fix was to change the default block
size of the array to the min the controller supported.
Steve
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