The KB article does look a bit tricky to me - I'm still confused as to why I can dd or drbd sync between two direct iSCSI volumes mounted on the same Proxmox server but from different SANs, but apparently I can't use Proxmox's live storage...
We've got some SANs providing iSCSI LVM storage to Proxmox VMs and we're in the process of replacing them with new SANs (iSCSI LVM again). Is there any way to live migrate the storage for running VMs from the old SANs' iSCSI to the new SANs'...