I deviced a workaround for this by mounting and unmounting my raid separately. The key is that I don't need it during boot, nor start any daemons that keep files open on it.
First, I added the "noauto" option to all the mounts on the raid in /etc/fstab. Then I added an upstart script as below. Note that the raid device and the mount points are hardcoded, so anyone using this needs to adapt them. It also doesn't hook into plymouth (aka bootsplash) like the normal mountall stuff does, so there aren't any nice messages and prompts if the mounts fail. /etc/init/local-mountraid.conf: description "Mount the imsm raid separately to work around LP #1320402" start on filesystem stop on runlevel [!23] task post-start script mdadm --assemble /dev/md/vol0 || : mount /more mount /d end script post-stop script umount /d umount /more mdadm --stop /dev/md/vol0 end script -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1320402 Title: mdadm resyncs imsm raid in "Normal" state To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mdadm/+bug/1320402/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs