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[Bug 752869] md raid1 doesn't boot after removing 1 disk, when the server is turned off

https://bugzilla.novell.com/show_bug.cgi?id=752869

https://bugzilla.novell.com/show_bug.cgi?id=752869#c2


--- Comment #2 from Wilfred van Velzen <wvvelzen@xxxxxxxxx> 2012-03-21 15:38:39
UTC ---
With the help of https://en.wikipedia.org/wiki/Mdadm, I found the right
commands to (re)assemble the raid arrays in the emergency console, in this
state:

mdadm --stop /dev/md0
mdadm --stop /dev/md2

mdadm --assemble /dev/md0 /dev/sda1 --run
mdadm --add /dev/md0 /dev/sdb1
[repeated for all the arrays]

And wait for the synchronization to finish, before rebooting. Checking this
with:

cat /proc/mdstat

So it isn't an unrecoverable state, but still rather inconvenient. Specially if
the machine is at a co-location and you have to drive for a X amount of time to
go to the location to find out what happend and fix it...

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