On Sunday July 17, dstrang@xxxxxxxxxxxxxx wrote: > -(root@abyss)-(/)- # mdadm --manage --add /dev/md0 /dev/sdaa > mdadm: hot add failed for /dev/sdaa: Invalid argument > > Jul 17 11:42:38 abyss kernel: md0: HOT_ADD may only be used with version-0 > superblocks. > > What, if anything, can I do since I'm using a version 1.0 > superblock? Use a newer mdadm. This works with v2.0-devel-2 (I just checked). NeilBrown - 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