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 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1196693 Title: Cannot boot degraded RAID1 array with LUKS partition To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1196693/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs