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[ubuntu] raid linear not starting

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linux-howto

http://ubuntuforums.org – I did someting wrong but now I can not fix this anymore. I had 2 disc in linear both ~600 gb I wanted to add 1 more of 400 gb. I did mdadm --grow /dev/md0 -a /dev/sdd1 I'm sure I did something wrong but this is the detail of md0: /dev/md0: Version : 1.2 Creation Time : Thu Dec 27 14:43:10 2012 Raid Level : linear Raid Devices : 3 Total Devices : 2 Persistence : Superblock is persistent Update Time : Sun Mar 24 14:06:08 2013 State : active, FAILED, Not Started Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 Roundin (Hardware)