From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ming Zhang Subject: unbalance? Date: Sat, 08 Oct 2005 12:25:59 -0400 Message-ID: <1128788759.5431.20.camel@localhost.localdomain> Reply-To: mingz@ele.uri.edu Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Sender: linux-raid-owner@vger.kernel.org To: Linux RAID List-Id: linux-raid.ids Hi folks I met a strange scenario here. i have a 4 sata disk raid0. i ran dd write with 512K request size and got this. it looks like 1 disk has particular low utilization compared with others. any idea? thanks! ming ----------------------------------------- avg-cpu: %user %nice %sys %iowait %idle 0.00 0.00 15.84 6.44 77.72 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util hda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sda 4648.51 0.00 309.90 0.00 39667.33 0.00 19833.66 0.00 128.00 0.91 2.95 2.95 91.49 sdb 4648.51 0.00 309.90 0.00 39667.33 0.00 19833.66 0.00 128.00 0.90 2.90 2.90 89.90 sdc 4648.51 0.00 309.90 0.00 39667.33 0.00 19833.66 0.00 128.00 0.25 0.79 0.79 24.55 ~~~~~~~~ sdd 4646.53 0.00 311.88 0.00 39667.33 0.00 19833.66 0.00 127.19 0.95 3.03 3.03 94.65 md0 0.00 0.00 19833.66 0.00 158669.31 0.00 79334.65 0.00 8.00 0.00 0.00 0.00 0.00