I don't think it's used by default for IMSM raid installation. That's why your devices were likely set up by dmraid first. When you mentioned in a previous comment about installing dracut-core, this automatically installs dmraid with kpartx. Mdadm never gets involved. When I've manually installed mdadm for IMSM raid, I first remove dmraid. That's the only way I was able to install Ubuntu 16.04 on top of IMSM raid1 via mdadm reliably.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1608495 Title: IMSM fakeraid handled by mdadm: unclean mounted volumes on shutdown/reboot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mdadm/+bug/1608495/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
