Date: Sat, 19 Jun 2010 11:58:44 +0200 From: oizs <oizs@freemail.hu> To: freebsd-current@freebsd.org Subject: Re: Dell Perc 5/i Performance issues Message-ID: <4C1C94D4.7040302@freemail.hu> In-Reply-To: <4C1C88CD.3000506@stillbilde.net> References: <4C1AB4C0.4020604@freemail.hu> <4C1C88CD.3000506@stillbilde.net>
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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. -zsozso 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) > > //Svein > >
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