Date: Thu, 17 Jun 2010 16:55:31 -0700 From: Chuck Swiger <cswiger@mac.com> To: oizs <oizs@freemail.hu> Cc: freebsd-current@freebsd.org Subject: Re: Dell Perc 5/i Performance issues Message-ID: <A594C946-32C0-4C4A-AA37-0E81D270162A@mac.com> In-Reply-To: <4C1AB4C0.4020604@freemail.hu> References: <4C1AB4C0.4020604@freemail.hu>
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On Jun 17, 2010, at 4:50 PM, oizs wrote: > I've bought a Dell Perc 5/i because I couldn't make the onboard marvell 88sx7042 work with 8.0/8.1 or current, but as lucky as I am, the best I can do with 4x1.5tb samsung in raid5 is 60MB/s writes and 90MB/s reads, with bbu/write-back/adaptive-read-ahead. > > I was expecting at least twice of that, and I'm not sure what can I do to get that speed. (I've read man 7 tuning with no success) Switch to using RAID-10 rather than RAID-5. It's normal for RAID-5 to have worse write performance than that of a single drive. Regards, -- -Chuck
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