Public bug reported:
Trusty installation is combined root + /boot within LVM on top of mdraid (type
1.x) RAID1 with one missing disk (degraded).
[method: basically create the setup in shell first then point install at the
lvm. at end of install create a chroot and add mdadm pkg]
boot fails with the following messages:
Incrementally starting RAID arrays...
mdadm: CREATE user root not found
mdadm: CREATE group disk not found
Incrementally starting RAID arrays...
and slowly repeats the above at this point.
workaround:
- add break=premount to grub kernel line entry
- for continue visibility of boot output also remove quiet, splash and
possibly set gxmode 640x480
now @ initramfs prompt:
mdadm --detail /dev/md0 should indicate a state of clean, degraded, array is
started so this part is ok
lvm lvs output attributes are as follows:
-wi-d---- (instead of the expected -wi-a----)
lvs manpage this means device tables are missing (device mapper?)
FIX: simply run lvm vgchange -ay and exit initramsfs. This will lead to
a booting system.
** Affects: lvm2 (Ubuntu)
Importance: Undecided
Status: New
** Tags: boot degraded lvm raid
** Package changed: cryptsetup (Ubuntu) => lvm2 (Ubuntu)
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https://bugs.launchpad.net/bugs/1351528
Title:
boot fails on raid (md raid1) + LVM (combined / + /boot) + degraded
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