From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sevrin Robstad Subject: bad performance on RAID 5 Date: Wed, 17 Jan 2007 22:33:52 +0100 Message-ID: <45AE9640.1040500@start.no> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7BIT Return-path: Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids 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