[Bug 1480399] Re: LVM over multipath setups fail to boot

[Mathieu Trudel-Lapierre]

This appears to be reproducible again on 18.10, except at very early
boot (premount):

Quiescing Open Firmware ...
Booting Linux via __start() @ 0x0000000002000000 ...
Linux ppc64le
#11-Ubuntu SMP T[    0.795638] integrity: Unable to open file: /etc/keys/x509_ima.der (-2)
[    0.795640] integrity: Unable to open file: /etc/keys/x509_evm.der (-2)
[    2.058041] vio vio: uevent: failed to send synthetic uevent
  WARNING: Failed to connect to lvmetad. Falling back to device scanning.
  WARNING: PV dgFjip-AMJ8-ZsA9-7e0j-fyJR-lodF-ASXSYz on /dev/sdb2 was already found on /dev/sda2.
  WARNING: PV dgFjip-AMJ8-ZsA9-7e0j-fyJR-lodF-ASXSYz prefers device /dev/sda2 because device was seen first.
  Cannot activate LVs in VG ubuntu-vg while PVs appear on duplicate devices.
  WARNING: Failed to connect to lvmetad. Falling back to device scanning.
  WARNING: PV dgFjip-AMJ8-ZsA9-7e0j-fyJR-lodF-ASXSYz on /dev/sdb2 was already found on /dev/sda2.
  WARNING: PV dgFjip-AMJ8-ZsA9-7e0j-fyJR-lodF-ASXSYz prefers device /dev/sda2 because device was seen first.
  Cannot activate LVs in VG ubuntu-vg while PVs appear on duplicate devices.


Breaking at premount, to have multipath load before LVM gets to load the
devices leads to a system that finishes booting but appears to be in
read-only filesystem.

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https://bugs.launchpad.net/bugs/1480399

Title:
  LVM over multipath setups fail to boot

Status in multipath-tools package in Ubuntu:
  Triaged

Bug description:
  Wily, using multipath-tools 0.5.0-7ubuntu2

  Installing Ubuntu on LVM over multipath disks fails to boot, falls to
  the recovery console from systemd (not the initramfs console).

  This is likely to be because of a race between LVM and multipath -- if
  LVM tries to pick up the device and locks it before multipath-tools
  can do its job.

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