Your probably hitting several bugs.
I have also seen some differences in the geometry of virtual drives (at
least I tent to size them to some human friendly number). I have seen
some "unused space" things and (c)fdisk complaining.
IIRC the most usefull way with md's partitionable array feature is to
use the entire disk ("sdX") as members. Then you can partition the md
device, and by this partition all mirror devices at the same time. If
you create the array from one member + "missing" the partition table on
the disk gets used for the raid. Mdadm will create only a configurable
number of device nodes for partitions though.
Does blkid detect sdX wrongly as raid?
mdadm --incremental defaults to set up arrays with partitionable device
nodes if auto= is not defined otherwise in mdadm.conf. Not a bad idea in
general, but mdadm is only able to do so during initramfs. (map file is
missing later). Also devices are not automatically removed from the
array and block readdition by incremental. See Bug #495370.
Bug #551719 enabled kernel raid autodetection disturbs udev/mdadm
(initramfs & later)
--
mount: mounting /dev/md0 on /root/ failed: Invalid argument
https://bugs.launchpad.net/bugs/569900
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