SUSE Linux Enterprise Server 11 Service Pack 3 (SLES 11 SP3)
Systems with more the 5TB of memory will not complete boot of the XEN hypervisor kernel.
A fix is available with xen-4.2.4_04-0.9.1 which allows the system to boot and simply does not use the memory above 5TB.
Prior to xen-4.2.4_04-0.9.1 this issue may be worked around by booting with a mem= argument.
mem must be set to a value lower than 5 TB then.