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List:       linux-raid
Subject:    Re: Is it possible to break one full RAID-1 to two degraded RAID-1?
From:       Reindl Harald <h.reindl () thelounge ! net>
Date:       2020-02-07 14:55:15
Message-ID: fe7b1e80-ebbb-da9f-dd09-2d10b4678851 () thelounge ! net
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Am 07.02.20 um 15:49 schrieb Ram Ramesh:
>>> 4. Make both bootable. (I suppose I need to change UUID of md1
>>>     partitions. I suppose that is easy)
>> Yes it's easy. Yes it should have been done a LOOONG time ago.
> Not if you break md0 into degraded md0 and md1. grub.cfg need to be
> updated after that fact and UUID update is only doable after breakup.
> Again not sure if I am missing something important implied by LOONG in
> your answer

grub itself is installed before the RAID and there is no need to change
any UUID - you just spit out one of the disks from your RAID, work in
degraded mode and if everyhting goes wrong you boot with a recue media
and assemble that disk, zero the one with the damaged OS and resync
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