When both drives connected could you please paste the output of
$ cat /sys/block/nvme[0-9]n[0-9]/{nguid,eui}
https://nvmexpress.org/wp-content/uploads/NVM-Express-
1_4b-2020.09.21-Ratified.pdf
As per ratified NVMe 1.4b specification, in figure 249 Identity
Namespace Data Structure the nguid and/or eui-64 fiends must be globally
unique. Or they may be initialised to the value of 0h to indicate empty.
If you have two drives, with two distinct namespaces, which are not
multipathed to access the single/same underlying disk, I expect the two
drives to have _different_ nguid & eui values.
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https://bugs.launchpad.net/bugs/1902855
Title:
two identical disks are only offered as a multipath device
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