Comment 8 for bug 652327

@whoop, will you please do the following:
1) copy your mdadm.conf somewhere safe
2) run /usr/share/mdadm/mkconf and see if the definition of md0 is in place. If so please use "generate" with mkconf to generate a new mdadm.conf.

While updating initramfs, the mdadm's initramfs hook expects that the mdadm.conf has *uuid's* instead of /dev/<node> kind of names. As you can see this is a warning which asks you to verify the array definition, just in case its not present. This is just to prevent the case that your array cannot be auto assembled (which at present it cant be with the current mdadm-2.6.7).

Meanwhile, I shall also look at what can be done about devices instead of uuids. Thanks a lot for filing this bug!