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List:       gentoo-user
Subject:    [gentoo-user] A drive in my RAID6 has failed
From:       Paul Hartman <paul.hartman () gmail ! com>
Date:       2013-09-05 16:49:20
Message-ID: CAEH5T2MiH6mtfvMf3c_AGKr=TV39vOxLDoGHNi2dQd2S9c1pOg () mail ! gmail ! com
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Hi,

I woke up this morning to see the dreaded email from mdadm telling me
one of my drives failed overnight, while I was happily dreaming about
cute puppies and kittens installing a rainbow-colored roof on my
house. The array is a RAID6 (two parity drives) and this is the
current state:

md0 : active raid6 sdd1[5] sdg1[4] sde1[3](F) sdh1[2] sdf1[1] sdi1[0]
      11720009728 blocks super 1.2 level 6, 512k chunk, algorithm 2
[6/5] [UUU_UU]

I've been using RAID in Linux for years, but this is actually the
first time I've had a disk fail in one.

If I remember correctly, the process should be as simple as:

#remove the failed disk from the array:
mdadm /dev/md0 -r /dev/sde1

#pull the drive, replace with new one, partition it, then add it to the array:
mdadm /dev/md0 -a /dev/sde1

and sit back and eat popcorn while I enjoy the blinkenlights for the
next several hours/days? :) Any advice/suggestions for managing this
process any differently?

For now I have unmounted the filesystem that sits atop it, to prevent
any more writes from occurring, just in case...

Thanks,
Paul

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