Re: migrate single disk to RAID 1?

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>> umount /dev/sdb4
>> mdadm --build /dev/md0 --level=1 -n2 /dev/sdb4 missing
>> mount /dev/md0 /mail
>> mdadm --add /dev/md0 /dev/sda4
>>
>> Will that work?  Or am I misunderstanding something fundamental?
>
> It'll work but you'll be using a legacy array without superblocks, so you
> can't have various features that come with superblocks

Right; for this particular application I'm willing to give up
superblocks.  Just to be 100% sure, thought:  the way I've described
the process would be non-destructive of the data on sdb4?

Thanks!

-Ben
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