I'm currently testing this in a 14.04.1 virtual machine.
After disconnecting one HDD, boot stays on "Waiting for encrypted source
device...", then drops to a shell (tried a few times before looking into it).
/proc/mdstat shows the array is assembled, but not been started. Manually
starting it (with `mdadm -R`) was successful, so I rebooted to try again.. it
booted fine degraded has done every boot since (below output is after booting
degraded).
My setup is:
2 HDDs. Each contains 1 partition which is part of a RAID1 array (md0).
md0 is LVM with a VG called "system".
"system" contains 2 LVs, boot (unencrypted), root (LUKS)
# mount | grep /dev/m
/dev/mapper/system-root_crypt on / type xfs (rw)
/dev/mapper/system-boot on /boot type ext4 (rw)
# mdadm --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Mon Jan 5 20:56:33 2015
Raid Level : raid1
Array Size : 20952960 (19.98 GiB 21.46 GB)
Used Dev Size : 20952960 (19.98 GiB 21.46 GB)
Raid Devices : 2
Total Devices : 1
Persistence : Superblock is persistent
Update Time : Wed Jan 7 16:28:18 2015
State : clean, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0
Name : ubuntu-raid1:0 (local to host ubuntu-raid1)
UUID : 66eefd8b:ad7f449d:73d180a0:cbcabb44
Events : 187
Number Major Minor RaidDevice State
0 8 1 0 active sync /dev/sda1
1 0 0 1 removed
** Tags added: trusty
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https://bugs.launchpad.net/bugs/1196693
Title:
Cannot boot degraded RAID1 array with LUKS partition
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