[Bug 1579586] Re: ppc64el node maas install failing talking to mpath0

[Mathieu Trudel-Lapierre]

Please attach the full logs for boot (you may need to boot with
"verbose" tacked on to the kernel command-line); including full logs for
the deployment via MAAS might help too.

multipath setup should be happening before LVM; and requires the
multipath-boot package to be installed. It's not unlikely for LVM to
fail to find "mpath0" in the case where multipath did not bring up the
devices since all these names will come straight from device-mapper.

Furthermore, this looks slightly off. On Xenial, the first multipath
device node should be (by default, unless this was changed by
configuration) named "mpatha", not "mpath0".

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https://bugs.launchpad.net/bugs/1579586

Title:
  ppc64el node maas install failing talking to mpath0

Status in multipath-tools package in Ubuntu:
  New

Bug description:
  I'm trying to install a PPC64EL node with Xenial via MAAS 1.9.2 using
  Juju 1.25.5 and it seems to be failing due to a possible multipath
  issue.  The node is setup in maas with a default single partition.
  The boot logs show:

    Begin: Running /scripts/init-premount ... done.
    Begin: Mounting root file system ... Begin: Running /scripts/local-top ...   lvmetad is not active yet, using direct activation during sysinit
      Volume group "mpath0" not found
      Cannot process volume group mpath0
    done.

  and then multiple repeats of:

    Begin: Waiting for root file system ... Begin: Running /scripts/local-block ...   lvmetad is not active yet, using direct activation during sysinit
      Volume group "mpath0" not found
      Cannot process volume group mpath0
    done.

  To finally fail with:

    Gave up waiting for root device.  Common problems:
     - Boot args (cat /proc/cmdline)
       - Check rootdelay= (did the system wait long enough?)
       - Check root= (did the system wait for the right device?)
     - Missing modules (cat /proc/modules; ls /dev)
    ALERT!  /dev/mapper/mpath0-part2 does not exist.  Dropping to a shell!
    Rebooting automatically due to panic= boot argument

  $ dpkg-query -W maas
  maas	1.9.2+bzr4568-0ubuntu1~trusty1
  $ dpkg-query -W juju-core
  juju-core	1.25.5-0ubuntu1~14.04.2~juju1

  Kernel version booting on the PPC64EL node is Linux version
  4.4.0-21-generic.

  Please let me know what further information you require to debug this.

  Thanks,
  Brad

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