[Bug 1902855] Re: two identical disks are only offered as a multipath device

[Dimitri John Ledkov]

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

Status in curtin package in Ubuntu:
  New
Status in multipath-tools package in Ubuntu:
  New
Status in probert package in Ubuntu:
  New
Status in subiquity package in Ubuntu:
  New
Status in curtin source package in Hirsute:
  New
Status in multipath-tools source package in Hirsute:
  New
Status in probert source package in Hirsute:
  New
Status in subiquity source package in Hirsute:
  New

Bug description:
  two identical SSDs are only offered as a multipath device in the
  server installer, not as single devices. The install succeeds, however
  the following boot falls back to the initramfs because the volume
  group cannot be found. Same hardware configuration as in LP: #1902845.

  blacklisting the dm_multipath module on the installer boot,  shows the
  two disks, however the installer later fails because the multipath and
  multipathd commands fail.

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