From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Raz Ben-Jehuda(caro)" Subject: Re: bad performance on RAID 5 Date: Thu, 18 Jan 2007 11:06:58 +0200 Message-ID: <5d96567b0701180106x5441f24dp117ffebdf560a23f@mail.gmail.com> References: <45AE9640.1040500@start.no> <45AEA550.5070005@lucidpixels.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <45AEA550.5070005@lucidpixels.com> Content-Disposition: inline Sender: linux-raid-owner@vger.kernel.org To: Justin Piszcz Cc: Sevrin Robstad , linux-raid@vger.kernel.org List-Id: linux-raid.ids did u increase the stripe cache size ? On 1/18/07, Justin Piszcz wrote: > Sevrin Robstad wrote: > > I'm suffering from bad performance on my RAID5. > > > > a "echo check >/sys/block/md0/md/sync_action" > > > > gives a speed at only about 5000K/sec , and HIGH load average : > > > > # uptime > > 20:03:55 up 8 days, 19:55, 1 user, load average: 11.70, 4.04, 1.52 > > > > kernel is 2.6.18.1.2257.fc5 > > mdadm is v2.5.5 > > > > the system consist of an athlon XP1,2GHz and two Sil3114 4port S-ATA > > PCI cards with a total of 6 250gb S-ATA drives connected. > > > > [root@compaq ~]# mdadm --detail /dev/md0 > > /dev/md0: > > Version : 00.90.03 > > Creation Time : Tue Dec 5 00:33:01 2006 > > Raid Level : raid5 > > Array Size : 1218931200 (1162.46 GiB 1248.19 GB) > > Device Size : 243786240 (232.49 GiB 249.64 GB) > > Raid Devices : 6 > > Total Devices : 6 > > Preferred Minor : 0 > > Persistence : Superblock is persistent > > > > Update Time : Wed Jan 17 23:14:39 2007 > > State : clean > > Active Devices : 6 > > Working Devices : 6 > > Failed Devices : 0 > > Spare Devices : 0 > > > > Layout : left-symmetric > > Chunk Size : 256K > > > > UUID : 27dce477:6f45d11b:77377d08:732fa0e6 > > Events : 0.58 > > > > Number Major Minor RaidDevice State > > 0 8 1 0 active sync /dev/sda1 > > 1 8 17 1 active sync /dev/sdb1 > > 2 8 33 2 active sync /dev/sdc1 > > 3 8 49 3 active sync /dev/sdd1 > > 4 8 65 4 active sync /dev/sde1 > > 5 8 81 5 active sync /dev/sdf1 > > [root@compaq ~]# > > > > > > Sevrin > > - > > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > > the body of a message to majordomo@vger.kernel.org > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > If they are on the PCI bus, that is about right, you probably should be > getting 10-15MB/s, but it is about right. If you had each drive on its > own PCI-e controller, then you would get much faster speeds. > > - > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- Raz