On Tue, 13 Sep 2022 21:54:21 +0200
Reindl Harald [off-list ref] wrote:

quoted

quoted

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.

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

that's already the case for 15 years here

but there is also mdadm.conf and sadly a copy in the intird

It has never occured to me to check, but you could also specify arrays by
"name=" there, instead of UUID. See "man mdadm.conf".

And it is possible to rename arrays:
https://askubuntu.com/questions/63980/how-do-i-rename-an-mdadm-raid-array

Having same-name arrays on different hosts seems much more reasonable than
same UUIDs.

-- 
With respect,
Roman