From mboxrd@z Thu Jan 1 00:00:00 1970 From: chapman Subject: raid 1 recovery steps Date: Sun, 24 Sep 2006 09:36:39 -0700 (PDT) Message-ID: <6473812.post@talk.nabble.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids Sorry for the noob question but I want to make sure I get this right. I have a raid 1 (sata) running on an active server - mdadm reports sda1 as faulty. Running "mdadm --examine /dev/sda1" shows the state as dirty, no errors - no failed devices. Can I assume the disk is ok, just needs to be re-added to the array? I'm assuming I need to first remove sda1 from the raid then re-add it, correct? If so, what are the specific steps? Can this be done safely on a live server without pulling the system down? How will this affect rebooting once completed - if at all? Any gotchas I should look out for? Here's some mdadm output... /sbin/mdadm --detail /dev/md0 /dev/md0: Version : 00.90.00 Creation Time : Thu Jan 27 09:55:22 2005 Raid Level : raid1 Array Size : 154183680 (147.04 GiB 157.88 GB) Device Size : 154183680 (147.04 GiB 157.88 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 0 Persistence : Superblock is persistent Update Time : Wed Sep 13 01:45:03 2006 State : dirty, no-errors Active Devices : 1 Working Devices : 1 Failed Devices : 1 Spare Devices : 0 Number Major Minor RaidDevice State 0 8 1 0 faulty /dev/sda1 1 8 17 1 active sync /dev/sdb1 UUID : 49f6e41a:28dde75c:8f133fe5:823322fb Events : 0.40 /sbin/mdadm --examine /dev/sda1 /dev/sda1: Magic : a92b4efc Version : 00.90.00 UUID : 49f6e41a:28dde75c:8f133fe5:823322fb Creation Time : Thu Jan 27 09:55:22 2005 Raid Level : raid1 Device Size : 154183680 (147.04 GiB 157.88 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 0 Update Time : Wed May 24 04:59:32 2006 State : dirty, no-errors Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Checksum : bce563ef - correct Events : 0.39 Number Major Minor RaidDevice State this 0 8 1 0 active sync /dev/sda1 0 0 8 1 0 active sync /dev/sda1 1 1 8 17 1 active sync /dev/sdb1 TIA for any assistance you can provide. --chapman -- View this message in context: http://www.nabble.com/raid-1-recovery-steps-tf2327020.html#a6473812 Sent from the linux-raid mailing list archive at Nabble.com.