From mboxrd@z Thu Jan 1 00:00:00 1970 From: Maurice Hilarius Subject: Question: how to identify failing disk in a RAID1 Date: Sun, 13 Apr 2008 13:14:21 -0600 Message-ID: <48025B8D.2030803@harddata.com> 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 Hi there. Recently I have been frequently seeing a damaged filesystem on a RAID1 on boot. a lengthy fsck does get it working, but I am seeing files disappearing as a result. I am pretty sure that one of the drives has developed some issues and needs to be replaced. How does one identify which of the 2 disks is the one that is failing? The system has 2 identical disks, and / is on md0 fstab: /dev/md0 / ext3 defaults 1 1 LABEL=/boot1 /boot ext2 defaults 1 2 tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 LABEL=/boot11 /boot1 ext2 defaults 1 2 LABEL=SWAP-sdb3 swap swap defaults 0 0 LABEL=SWAP-sda2 swap swap defaults 0 0 fdisk -l shows me: Disk /dev/sda: 400.0 GB, 400088457216 bytes 255 heads, 63 sectors/track, 48641 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 13 104391 83 Linux /dev/sda2 14 535 4192965 82 Linux swap / Solaris /dev/sda3 536 48641 386411445 fd Linux raid autodetect Disk /dev/sdb: 400.0 GB, 400088457216 bytes 255 heads, 63 sectors/track, 48641 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdb1 * 1 13 104391 83 Linux /dev/sdb2 14 48118 386403412+ fd Linux raid autodetect /dev/sdb3 48119 48640 4192965 82 Linux swap / Solaris Disk /dev/md0: 395.6 GB, 395677007872 bytes 2 heads, 4 sectors/track, 96600832 cylinders Units = cylinders of 8 * 512 = 4096 bytes Anyone have a suggestion, please? Responses off list are probably most appropriate. Thanks for any help. -- Regards, Maurice mhilarius@gmail.com