Date: Sat, 19 Jun 2010 02:27:05 +0200 From: oizs <oizs@freemail.hu> To: freebsd-current@freebsd.org Subject: Re: Dell Perc 5/i Performance issues Message-ID: <4C1C0ED9.8090103@freemail.hu> In-Reply-To: <AANLkTimsHZLREByndqXEjt2yjdvOYVV7Rnw8AMjqxYIl@mail.gmail.com> References: <4C1AB4C0.4020604@freemail.hu> <A594C946-32C0-4C4A-AA37-0E81D270162A@mac.com> <4C1B3792.9000007@freemail.hu> <AANLkTimsHZLREByndqXEjt2yjdvOYVV7Rnw8AMjqxYIl@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
Im using the Samsung F3 disks, which can do 140MB/s sequentially. I have tried different raids raid0 will do just as bad as raid5. I even tried one disk which performed as expected 100MB/s+ reads and writes so I'm not sure anymore what could be the problem. Maybe the controller hates samsung disks? -zsozso On 2010.06.19. 0:21, krad wrote: > 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 > _______________________________________________ > 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" > > >
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4C1C0ED9.8090103>