Date: Fri, 18 Jun 2010 23:21:55 +0100 From: krad <kraduk@googlemail.com> To: oizs <oizs@freemail.hu> Cc: freebsd-current@freebsd.org Subject: Re: Dell Perc 5/i Performance issues Message-ID: <AANLkTimsHZLREByndqXEjt2yjdvOYVV7Rnw8AMjqxYIl@mail.gmail.com> In-Reply-To: <4C1B3792.9000007@freemail.hu> References: <4C1AB4C0.4020604@freemail.hu> <A594C946-32C0-4C4A-AA37-0E81D270162A@mac.com> <4C1B3792.9000007@freemail.hu>
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On 18 June 2010 10:08, oizs <oizs@freemail.hu> wrote: > 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, >> >> > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org" > what are your drives though? Are they SATA green/eco type drives or proper SAS enterprise ones
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