From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Liontooth Subject: Add a spare to a poorly defined raid1 Date: Wed, 15 Feb 2012 17:51:12 +0530 Message-ID: <4F3BA338.6030204@cogweb.net> 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 Not knowing what I was doing, I created a RAID1 with a single drive and a spare, as below. I'd like to add the spare to the array. How do I do this without rebooting? Cheers, Dave # definitions of existing MD arrays ARRAY /dev/md0 level=raid1 num-devices=1 UUID=9921faab:5d93510e:0db287f1:dc103b07 spares=1 # mdadm --detail /dev/md0 /dev/md0: Version : 0.90 Creation Time : Fri Jul 18 14:57:40 2008 Raid Level : raid1 Array Size : 104320 (101.89 MiB 106.82 MB) Used Dev Size : 104320 (101.89 MiB 106.82 MB) Raid Devices : 1 Total Devices : 2 Preferred Minor : 0 Persistence : Superblock is persistent Update Time : Wed Feb 15 03:37:11 2012 State : clean Active Devices : 1 Working Devices : 2 Failed Devices : 0 Spare Devices : 1 UUID : 9921faab:5d93510e:0db287f1:dc103b07 Events : 0.218 Number Major Minor RaidDevice State 0 8 1 0 active sync /dev/sda1 1 8 17 - spare /dev/sdb1