On Sat, Jun 19, 2010 at 7:56 PM, Scott Long <scottl_at_samsco.org> wrote: > On Jun 19, 2010, at 5:32 AM, Garrett Cooper wrote: >> On Sat, Jun 19, 2010 at 4:24 AM, Garrett Cooper <yanefbsd_at_gmail.com> wrote: >>> On Sat, Jun 19, 2010 at 4:21 AM, oizs <oizs_at_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_at_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? >>> >>> If your applications aren't well suited for your hardware's >>> capabilities, then of course performance will be bad. >> >> Furthermore, if the performance applications and your use scenarios >> are centered around reading, as opposed to writing, there is an option >> within mficontrol and the mfi(4) interface where you can actually >> enable read-ahead, instead of writeback (you unfortunately can't >> enable both scenarios). I realize that this is an artificial >> improvement in a way, but you should judge whether or not your >> application will be doing more reading than writing in whatever >> capacity it's doing... >> >> HTH, > > No, that doesn't help. I wrote the driver, and I have no flipping clue what you're talking about. Nevermind. It was a misunderstanding of what the subcommands... - mfiutil cache .. enable - mfiutil cache .. reads enable - mfiutil cache .. writes enable ... do. -GarrettReceived on Sun Jun 20 2010 - 02:31:50 UTC
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