Since it is a test install I gave the LSI SMIS Provider MR 6.7 for ESXi 5.5 a try... and it worked :smileycool:
The only thing needed was starting the CIM server and MSM found the ESXi host (doesn't mention OS or health) but once logged in I could fully manage my LSI 9266-8i without any problem (I even upgraded its firmware this way).
In the vSphere client I now also see the full storage details (Configuration / Health status) including battery status.
Just hope the e-mail alarms work fine when MSM is closed.