On 04/05/20 12:26, Stefanie Leisestreichler wrote:

Thanks, Wol, especially for the hint with the GUIDs, will keep this in
mind. If ever using it again - maybe in case of a quick temporary
replacement in the original computer - I will wipe it with zeros before.

And what Johannes said ... oh and I believe gdisk has an option that
will change guids for you without affecting anything else.

Wiping it with zeroes will take a long time - it might well be mdadm I
think it has an option to wipe the raid superblock.

Note that both the partitions and the raid will have guids, so moving
drives around can be fraught ...

The partition layout will be cloned using sfdisk.

Thanks for the wiki links. I read the wiki before asking but it was not
clear to me how to do it...

Btw, I will stay with mdadm/lvm/ext4 and not switch to btrfs.

That's good - my feelings entirely as btrfs may be a decent file system,
but I gather parity raid is experimental as in it will probably eat your
data at some point and may be unfixable. I gather it also does NOT
mirror your data by default (typical computer scientists - they consider
the filesystem structure valuable and assume the user can retrieve the
data from backup ... :-(

lvm gives you snapshotting and stuff ...

And my current (and planned new) systems both have the root filesystem
on a separate partition from /home, so if I wanted I could have root on
a 1.0 mirror - not especially recommended but there are good reasons for
it ...

Thanks again,
Steffi

Cheers,
Wol