Sorry, but I just noticed a new wrinkle that may be helpful (particularly for others googling this later) mdadm -D reports a UUID that agrees with blkid as opposed to mkconf However I noticed that the "section delimiters" within the UUID are colons rather than dashes, and in a few places these colons are in different places compared to blkid's dashes. I've tested mdadm --update=uuid and this has (quite logically) allowed me to just use a number string without any dashes or colons. I've got a big RAID6 currently rebuilding under sysresccd, so I can't test with the debian/ubuntu tools ATM, but I'll try to remember to do so in the 10-12 hours that'll take to finish. -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html