Just attempted this without much thinking: http://pastebin.com/eWy2n0hq
Similar situation as reported by b-candler. Upon reboot after that, the system root drive was /dev/sda ,/dev/sdb unused. If I try to force an mdadm assemble, it only pulls in /dev/sdb since sda is in use by the operating system. {{{ callaghan@callaghan-family:/dev/disk$ cat /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md126 : inactive sdb[0] 62520452 blocks super external:/md127/0 md127 : inactive sdb[0](S) 2260 blocks super external:imsm }}} I also tried to run "update-grub", but afterwards I can see that /etc/grub/grub.cfg is now set to boot from /dev/sda (by-uuid), not any mdadm. Somehow need to get "update-grub" to reconfigure for mdadm/mdraid support. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1028677 Title: mdadm should be used for fakeraid (instead of dmraid) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/debian-installer/+bug/1028677/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs