I have read success reports that using "--create" on an array that
already exists should preserve the disk data.
So to upgrade the superblock version one can simply do a --create with =
newer version requested?
What exactly happens to the partition and filesystem on the disk when
one does mdadm --create or --zero-superblock?
Does it get altered at all?
Citando Vasco N=E9voa <vasco.nevoa [at] sapo.pt>:
>
> Hello.
>
> I'd like to know if it is possible to upgrade the superblock model
> version of an array, from 0.9 to 1.0 for example.
>
> Theoretically it should be possible, I think. What would be the safe =
> steps to do it?
>
> I imagine something like:
> - zeroing the current superblocks in all the array disks;
> - (optionally) assembling the array in "build" mode, ignoring superbl=
ocks;
> - updating the superblocks using the desired version.
>
> If that isn't possible, then:
> - zeroing the current superblocks in all the array disks;
> - creating a new array with those disks, using the desired
> superblock version and --assume-clean;
> - would this lead to the loss of the partition table inside the array=
?
>
> Has anyone done such a thing?
> How should I proceed?
>
> Thanks,
> Vasco.
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