Date: Sat, 19 Jun 2010 04:17:19 -0700 From: Garrett Cooper <yanefbsd@gmail.com> To: oizs <oizs@freemail.hu> Cc: freebsd-current@freebsd.org Subject: Re: Dell Perc 5/i Performance issues Message-ID: <AANLkTikwO5OGEzdiXnq7KXdROjrW8jlzx7vfmpHGJ1S8@mail.gmail.com> In-Reply-To: <4C1C94D4.7040302@freemail.hu> References: <4C1AB4C0.4020604@freemail.hu> <4C1C88CD.3000506@stillbilde.net> <4C1C94D4.7040302@freemail.hu>
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On Sat, Jun 19, 2010 at 2:58 AM, oizs <oizs@freemail.hu> wrote: > I tried almost everything raid 0 1 5 10 with all kind of stripes 32/64/128 > and settings direct io/cached/read-ahead/wt/wb/disk-cache but nothing seems > to work. > I changed the card to another dell perc 5 which had an older firmware. Tried > 4 kind of motherboards even tried changing the os to linux and windows xp/7. > In windows I got some funny results 1.3MB/s with write-back and 150MB/s > reads with 5 disks in raid0. > I just wanted to have a hw raid with no problems since the motherboard > 88sx7042 and bsd did not like eachother. > > On 2010.06.19. 11:07, Svein Skogen (Listmail Account) wrote: >> >> On 18.06.2010 01:50, oizs wrote: >> >>> >>> Hi, >>> >>> 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) >>> >>> As far as I know this controller should be as fast as on other systems. >>> (Freebsd.org mx1 has one of these cards.) >>> >>> I'm hoping somebody on the list reads this and helps because I can't >>> afford to buy another card. >>> >> >> I've lost track of what actual boards Dell has OEMized to make the >> various PERCs, but if I remember somewhat correctly, the PERC5 is >> basically an LSI Megaraid SAS 8308elp with different labels and firmware? >> >> If so, I've got that exact controller (minus the dell labels and >> firmware) in my primary storage box here, and yes, you SHOULD be able to >> get more performance out of it. What's your strip sizes and logical disk >> layout? >> >> (I've got the same board running on 8x 1T5 Seagates in RAID5+0, and that >> setup easily pulls 5 times the values you're seeing, and by all logic >> you should see about half of what I'm seeing) Dumb question: are you sure that the problem that you're seeing isn't in fact inhibited by the application that you're getting `performance' results with? HTH, -Garrett
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