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

[Michael Hudson-Doyle]

I think there is no doubt that Matthias's disks are bad and the default
behaviour is OK, but I would hope that disabling multipath via the
kernel would allow an installation as desired. But it seems curtin
doesn't quite work this way. Part of the issue IIRC is that the curtin
multipath support doesn't assume multipathd is actually running, as for
some versions of Ubuntu multipath-tools wasn't included in the
environment curtin runs in. I don't think that's true for recent
releases, but it might be true for xenial which MAAS presumably still
has to support installing...

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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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