I was also testing raid5, using Ubuntu 9.04 x64 Alternate, and hit this problem after rebooting. After reading post #24, I checked /proc/mdstat and it indicated that there was an inactive array md_d0 which had one of my drives listed. After stopping this array, the problem went away and the raid would mount.
-- mdadm cannot assemble array as cannot open drive with O_EXCL https://bugs.launchpad.net/bugs/27037 You received this bug notification because you are a member of Ubuntu Bugs, which is a direct subscriber. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs