Date: Wed, 06 Oct 2004 11:21:46 +0100 From: Mike Woods <Mike@the-rubber-chicken-network.co.uk> To: Yui Sakazume <saka@sgi.co.jp> Cc: freebsd-questions@freebsd.org Subject: Re: RAID performance Message-ID: <4163C73A.6070803@the-rubber-chicken-network.co.uk> In-Reply-To: <20041006.191834.229740712.saka@sgi.co.jp> References: <20041006.191834.229740712.saka@sgi.co.jp>
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Yui Sakazume wrote: >Hello, > >I have installed FreeBSD-4.10 to NEC Express5800 120R. >I attached LSI Logic MegaRAID SATA 150-6 with six SATA disks. >And configure RAID 5 LUN. >But, I/O prformance is poor(about 5MB/s). > >Is amr suitable for MegaRAID SATA 150-6 ? >Please tell me newfs parameters if there is recommendation. > > Write operations on raid 5 take a massive performance hit, most controllers will try to compensate with caching tricks but i suspect this could well be the cause of your problems. -------------- Mike Woods IT Technician
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