Hi,
I'm having problems with RAID0 to RAID5 file copy (both mdadm - setup under Proxmox). Haven't tried if the same goes the other way yet. Some info:
RAID0 - PVE + LVM VMs - 3x 500GB
RAID5 - LVMs for other DATA - 13x 2TB
Guest OS is Ubuntu 12.04.1.
OSs partiton is a LVM on RAID0 - filesystem...