On Tue, 26 Nov 2024, Felix Miata wrote:

The use of LABELs is attractive, but I notice you have the same label for sda5
and sdb5.  This means you cannot intervene on "msi85:0tmp".  You have to specify
sda5 or sdb5.

Not at all. hr18md0tmp is an ext4 filesystem LABEL. I wouldn't want to disturb 
its
two underlying partitions separately except via mdadm.

"except via mdadm" : exactly the point I would like to make. mdadm needs to be able to address the individual underlying devices. Only /dev/sdxn style addressing can do this, not duplicate UUIDs, or duplicate LABELs.

Roger

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