I've been hit with the same problem with a fresh feisty install (10 feb install cd), booting often doesn't work and always results in incomplete raid arrays.
This is with 2x 80gb sata, and 7 raid1 devices. The current mdadm initramfs script is unsuitable for release. -- initramfs script: race condition between sata and md https://launchpad.net/bugs/75681 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
