Date: Fri, 18 Jun 2010 11:08:34 +0200 From: oizs <oizs@freemail.hu> To: freebsd-current@freebsd.org Subject: Re: Dell Perc 5/i Performance issues Message-ID: <4C1B3792.9000007@freemail.hu> In-Reply-To: <A594C946-32C0-4C4A-AA37-0E81D270162A@mac.com> References: <4C1AB4C0.4020604@freemail.hu> <A594C946-32C0-4C4A-AA37-0E81D270162A@mac.com>
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I've seen people with the same configuration doing 160MB/s writes and 250MB/s+ reads with raid5 so I still think something isn't right. And using raid10 with 4 disks is a rather large waste of capacity. -zsozso On 2010.06.18. 1:55, Chuck Swiger wrote: > 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, >
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