I have compiled a new Intel Modular Server multipath driver for Citrix XenServer 6.1 XS61E014 kernel based on instructions on my earlier post:

Compile an Intel Modular Server multipath driver for XenServer 6.0.2 XS602E005 kernel with XenServer DDK

Download the ready-made driver for XenServer 6.1 XS61E014 kernel from here:

scsi_dh_alua_intelmodular_cbvtrak_xs61e014.i386.tar