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Message #06801
[Bug 1351528] Re: boot fails on degraded raid (mdraid) due to LVM root (combined / + /boot) missing device tables at mount time
The primary difference that I see for degraded boot is this error just ahead of activating volume group 'dataone'
'watershed sh -c '/sbin/lvm vgscan; /sbin/lvm vgchange -a y''(err) ' device-mapper: reload ioctl on failed: Invalid argument'
and also after that point the 55-dm and 56-lvm rules do not fire and
create the device setup like what happens in the _normal.txt log.
If anyone does compare these logs you can search for the volume group
name 'dataone' on both files to see what I am referring to.
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https://bugs.launchpad.net/bugs/1351528
Title:
boot fails on degraded raid (mdraid) due to LVM root (combined / +
/boot) missing device tables at mount time
Status in “lvm2” package in Ubuntu:
New
Bug description:
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.
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References