How do I change the disk order for RHEV VMs?

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Issue

How do I change the disk order for RHEV VMs?
VM's boot device name changed and VM won't boot.
A RHEL guest's disks are ordered incorrectly inside the guest, e.g. the boot disk is 'vdb' and the data disk is 'vda'.

Environment

Red Hat Enterprise Virtualization 3.x

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