Comment 18 for bug 75681

Ian Jackson <email address hidden> writes:
> 1. Check that
> cat /proc/partitions
> lists all of the components of your array. If not, then we need to
> understand why not. What are those components ? You will probably
> find that it does not list the array itself. If it does then we
> need to understand why it doesn't seem to be able to mount it.

I notice thay my 'real' partitions (/dev/sd[a,b][1..7]) do appear, but
only md0, not my other md[1..3] devices. Moreover, after checking
/proc/mdstat, /dev/md0 is started in degraded mode.

My setup: /dev/md0 is a mirror of /boot. md1 is a mirror of swap, md2 is
a mirrored volume group with my home (and backup of root), md3 is the
rest with a striped volume group.

> 2. Run
> /scripts/local-top/mdadm from-udev
> (NB `from-udev' is an argument you must pass to the script)
> and see if it fixes it. (If so it will show up in /proc/partitions
> and be mountable.)

Running that script makes /dev/md[1..3] come up in non-degraded mode,
md0 stays in degraded mode. LVM is not started automatically. After
typing 'lvm vgscan ; lvm vgchange -ay', my LVMs come up and I can
continue booting with CTRL-D.

Interestingly, this seem to happen most of the time. Just before I
booted with mdadm_2.5.6-7ubuntu3, and the system came up just fine. Note
that this happened exactly once to me so far.

--
Gruesse/greetings,
Reinhard Tartler, KeyID 945348A4