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

[Frank Heimes]

Tests showed that this problem (grub install) does not happen with the live-server image, which is the default image for 20.04 and includes a new installer (subiquity instead of d-i - we now started to flag d-i as legacy).
The image is available here: http://cdimage.ubuntu.com/ubuntu/releases/20.04/release/
If you are prompted to update the installer, when you started the installation at the 2nd screen (after you selected the language), it's recommended to do so to benefit from the latest version with latest fixes.
I'm closing this ticket now - in case you will run into other problems, please open a separate LP bug. Thx


** Changed in: grub2 (Ubuntu)
       Status: Incomplete => Invalid

** Changed in: ubuntu-power-systems
       Status: Incomplete => Fix Released

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

Title:
  Grub Installer error for multipath disk

Status in The Ubuntu-power-systems project:
  Fix Released
Status in grub2 package in Ubuntu:
  Invalid

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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