Update: we dd'ed the 3 partitions into copies, used those to --create the array without fearing data loss, which seems to have worked. As I type, dd is in progress from the recreated degraded raid10 array over to a new raid1 partition.
Update: we dd'ed the 3 partitions into copies, used those to --create the array without fearing data loss, which seems to have worked. As I type, dd is in progress from the recreated degraded raid10 array over to a new raid1 partition.