During the last weeks I installed four HP Blades with Windows Server 2012 for use in a Hyper-V Cluster.
The disks subsystem being used is a HP EVA.
After installing MPIO, I presented LUNs to the Blades.
Unfortunately, on three of the Servers, each disk was shown for times. Looked like MPIO was not working.
Checking the MPIO GUI, it showed only HSV200 as supported device. No other Enterprise Storage was registered.
After some time of research, I found the command for registering other devices:
mpclaim.exe -r -i -a “”
This adds support for all devices that are enterprise storage devices.
After running this, I restarted my servers and each disk was only shown once and also the MPIO GUI looked a little different: