> Since your exporting the storage as iSCSI, the host machine will see
> it as a raw disk, irrespective of how it's setup on the exported
> server. So, yes, you can do this.
Sorry for my ambiguity, I meant that mdadm would be on the host machine.
e.g. Using just a 2 node, raid 1 situation
Storage 1
-> Disk exported on 192.168.1.10, 192.168.2.10
Storage 2
-> Disk exported on 192.168.1.20, 192.168.2.20
Host
-> mdadm multipath md0 = 192.168.1.10, 192.168.2.10
-> mdadm multipath md1 = 192.168.1.20, 192.168.2.20
---> mdadm raid 1 md2 using md0 md1