Re: raid1 recoverable after system crash?

[Roman Mamedov <rm@romanrm.net>]

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On Thu, 07 Apr 2016 08:44:46 -0400
"Brian J. Murrell" <brian@interlinx.bc.ca> wrote:

> # cat /proc/mdstat 
> Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
> md0 : active raid1 sdd[0]
>       1953514496 blocks [2/1] [U_]
>       
> md1 : active raid0 sdc[1] sdb[0]
>       1953524736 blocks super 1.2 512k chunks
...
> Is my only option here to fail/remove /dev/md1 from the array and re-
> add it that way or is there a more graceful recovery possible here?

You do not have a write intent bitmap at md0, so re-add will not work. Seems
like you should --add it now, then after it rebuilds use --grow to add a
bitmap, so that in the future you could use -re-add.

As to why the situation occured in the first place, you should ensure that md1
assembles before md0. Perhaps by listing both arrays in /etc/mdadm/mdadm.conf
in the order you need (and don't forget to re-generate initrd.img).

-- 
With respect,
Roman

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