[Gllug] RAID on RAID

[Tethys]

Rich Walker writes:

>> Which reminded me that I'd been meaning to ask about that. As far as
>> I can see, the only way to do mirroring in Linux is with md, which
>> sits below LVM. This is a hideously broken design. Say I add a new
>> disk to my system, and decide I want to mirror the old disk. It can't
>> be done because the mirror needs to be created before the filesystem.
>
>I just created two LVM volumes, and then built a raid-1 array from them.

Now having never used md under Linux, I don't know for sure, but doesn't
it blow away the contents of the devices used? I want to mirror the disk
after it has a filesystem on it, without destroying the data, and without
needing to go through a backup/restore cycle.

Tet
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