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Strange udev issues when restarting RAID on ephemeral drives #220

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temujin9 opened this issue Dec 10, 2012 · 0 comments

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atomic bugfix important simple

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temujin9 commented Dec 10, 2012

Restarting a computer using the raid recipe will fail on reassembling the RAID:

sudo mdadm --create /dev/md0 --chunk=16 --level 0 --raid-devices 4 /dev/xvdb /dev/xvdc /dev/xvdd /dev/xvde
mdadm: device /dev/xvdb not suitable for any style of array

The core of the problem is described here: http://dev.bizo.com/2012/07/mdadm-device-or-resource-busy.html

Solution is:

udevadm control --stop-exec-queue
mdadm --create /dev/md0 --run --level=0 --raid-devices=4 ...
udevadm control --start-exec-queue

sudo mdadm --manage --stop /dev/md127 may also be necessary before the create will work correctly.

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