From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sevrin Robstad Subject: Re: bad performance on RAID 5 Date: Thu, 18 Jan 2007 19:20:18 +0100 Message-ID: <45AFBA62.1060206@start.no> References: <45AE9640.1040500@start.no> <45AEA550.5070005@lucidpixels.com> <5d96567b0701180106x5441f24dp117ffebdf560a23f@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7BIT Return-path: In-reply-to: <5d96567b0701180106x5441f24dp117ffebdf560a23f@mail.gmail.com> Sender: linux-raid-owner@vger.kernel.org To: "Raz Ben-Jehuda(caro)" Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids I've tried to increase the cache size - I can't measure any difference..... Raz Ben-Jehuda(caro) wrote: > 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 >> > >