[Bug 1864677] Re: Grub Installer error for multipath disk

[Andrew Cloke]

Marking as "incomplete" while waiting for test results from a multipath
system when using the subiquity installer.

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https://bugs.launchpad.net/bugs/1864677

Title:
  Grub Installer error for multipath disk

Status in The Ubuntu-power-systems project:
  Incomplete
Status in grub2 package in Ubuntu:
  Incomplete

Bug description:
  Installing daily focal from Feb 21 2020.

  IBM 8284-22A PowerVM 3.1.1.10
  Multipath Virtual SCSI drives provided by Shared Storage Pool from VIO 1 & 2

  Upon getting to the installing grub boot loader,  grub-probe failes
  with canonical error about unable to find /dev/mapper/mpatha2

  Exiting to shell I find:
  /dev/mapper/mpatha-part2 , not /dev/mapper/mpatha2

  kpartx -a /dev/mapper/mpatha  rebuilds the devices

  Exit shell,
  grub installer completes,  system reboots.

  After reboot, error: 
  Gave up waiting for root file system device.  Common problems:
   - Boot args (cat /proc/cmdline)
     - Check rootdelay= (did the system wait long enough?)
   - Missing modules (cat /proc/modules; ls /dev)
  ALERT!  /dev/mapper/mpatha2 does not exist.  Dropping to a shell!

  Dropped to shell, ran kpartx -a /dev/mapper/mpatha, exit shell and OS
  boots up as normal.

  There's a confusion between what the OS is looking for and what is
  getting created from kpartx during udev?

  (initramfs) cd /dev/mapper
  (initramfs) ls -l
  crw-------    1   10, 236 control
  lrwxrwxrwx    1         7 mpatha -> ../dm-0
  lrwxrwxrwx    1         7 mpatha-part1 -> ../dm-1
  lrwxrwxrwx    1         7 mpatha-part2 -> ../dm-2
  (initramfs) kpartx -a /dev/mapper/mpatha
  (initramfs) ls -l
  crw-------    1   10, 236 control
  lrwxrwxrwx    1         7 mpatha -> ../dm-0
  lrwxrwxrwx    1         7 mpatha1 -> ../dm-1
  lrwxrwxrwx    1         7 mpatha2 -> ../dm-2

  aixadmin at ubuntu:~$ cat /etc/os-release
  NAME="Ubuntu"
  VERSION="20.04 LTS (Focal Fossa)"
  ID=ubuntu
  ID_LIKE=debian
  PRETTY_NAME="Ubuntu Focal Fossa (development branch)"
  VERSION_ID="20.04"
  HOME_URL="https://www.ubuntu.com/"
  SUPPORT_URL="https://help.ubuntu.com/"
  BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
  PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
  VERSION_CODENAME=focal
  UBUNTU_CODENAME=focal
  aixadmin at ubuntu:~$ uname -a
  Linux ubuntu 5.4.0-14-generic #17-Ubuntu SMP Thu Feb 6 22:47:13 UTC 2020 ppc64le ppc64le ppc64le GNU/Linux
  aixadmin at ubuntu:~$ date
  Tue 25 Feb 2020 11:47:28 AM EST

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