Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: lvm2 (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1351528
Title:
boot fails for LVM on degraded raid due to missing device tables at
premount
Status in “lvm2” package in Ubuntu:
Confirmed
Bug description:
This is a Trusty installation with combined root + /boot within LVM on top of
mdraid (type 1.x) RAID1. Raid1 was built with one missing disk (degraded).
[method: basically create raid/VG/LV setup in shell first then point
installer at the lvm. At the end of the install create a chroot, add the mdadm
pkg, and update-initramfs before reboot.]
The boot process 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 continued visibility of text 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.
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