Currently running SLES 11 SP4 with HA

I can live migrate VMs (Windows and SLES) between the hosts. The VM disks are on the shared SAN (SAN1).

Now we have another SAN (SAN2) and would like to move the VM disks over to SAN2. Can this be done live? I haven't seen a place to do this within any utility. Or must this be done the old school way with downtime of stopping the VM, copy the VM disks to SAN2, config the VM xml to point to SAN2 and start the VM?

Could someone point me in the proper direction?

Thank you.
(plan to move to SLES 12 SPx later this year)