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

[Matthias Klose]

> The intent is that what mulitpath-tools does on boot is reflected
> in the installer. If it is disabled by kernel command line or
> whatever, the disks should not be multipathed. It's possible this
> is not what happens, but it's not by design.

yes, that's what is not working. with multipath disabled on the command
line, I see:

Nov 06 11:11:08 | libdevmapper version 1.02.167 (2019-11-30)
Nov 06 11:11:08 | DM multipath kernel driver not loaded
===== paths list =====
uuid hcil    dev     dev_t pri dm_st chk_st vend/prod/rev                     
     0:1:1:1 nvme0n1 259:0 -1  undef undef  NVME,Force MP600                  
     1:1:1:1 nvme1n1 259:1 -1  undef undef  NVME,Seagate FireCuda 520 SSD ZP20
     2:1:1:1 nvme2n1 259:2 -1  undef undef  NVME,Force MP600                  
     1:0:0:0 sda     8:0   -1  undef undef  ATA,WDC WD141KRYZ-01              
     6:0:0:0 sdb     8:16  -1  undef undef  ATA,WDC WD141KRYZ-01              

as seen in the crash report, all multipath queries are answered with no,
then the installer tries to run multipath ...


** Attachment added: "crash report"
   https://bugs.launchpad.net/ubuntu/+source/subiquity/+bug/1902855/+attachment/5431868/+files/1604660785.646308899.install_fail.crash.gz

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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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