Date: Sat, 19 Jun 2010 04:24:48 -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: <AANLkTikTzSft6BEVYB4pLZ39989jVDS5_6xRdLkyeBzH@mail.gmail.com> In-Reply-To: <4C1CA852.6000900@freemail.hu> References: <4C1AB4C0.4020604@freemail.hu> <4C1C88CD.3000506@stillbilde.net> <4C1C94D4.7040302@freemail.hu> <AANLkTikwO5OGEzdiXnq7KXdROjrW8jlzx7vfmpHGJ1S8@mail.gmail.com> <4C1CA852.6000900@freemail.hu>
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On Sat, Jun 19, 2010 at 4:21 AM, oizs <oizs@freemail.hu> wrote: > Since I tested it on different kind of os's, and with at least 5 testing > applications, I don't think that would be the case. > > On 2010.06.19. 13:17, Garrett Cooper wrote: >> >> On Sat, Jun 19, 2010 at 2:58 AM, oizs<oizs@freemail.hu> =A0wrote: >> >>> >>> 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 marve= ll >>>>> 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 read= s, >>>>> with bbu/write-back/adaptive-read-ahead. >>>>> >>>>> I was expecting at least twice of that, and I'm not sure what can I d= o >>>>> 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 system= s. >>>>> (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 di= sk >>>> layout? >>>> >>>> (I've got the same board running on 8x 1T5 Seagates in RAID5+0, and th= at >>>> 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? If your applications aren't well suited for your hardware's capabilities, then of course performance will be bad. -Garrett
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