I know there might be issues with cimserver and different versions of SMI-S solutions. SAN-OS 3.2 uses 1.1 and 3.3 and above uses 1.2. The changes are considerable and can make some SMI-S system not work well. I don't know if NX-OS is supported yet.
I don't use HP SIM so I really can't say for sure but its worth checking on what is supported.