On Tue, 13 Sep 2022 15:02:41 +0200
Reindl Harald [off-list ref] wrote:

quoted

I would not convert existing arrays. Rather create new arrays on the new 
disks and copy the data

i want my identical machines to stay as they are with all their UUIDs 
which is the main topic here

it's not funny when you are used to rsync your /etc/fstab over 11 years 
that doing so would lead in a unbootbale system on the other side

For this I'd suggest to use LABEL=rootfs (and so on) in fstab, instead of
UUIDs.

Or with LVM, /dev/vgname/lvname.

It's kind of the point of UUIDs that they are supposed to be (even globally)
unique, and there should not be the same UUID on two different machines.

-- 
With respect,
Roman