RDM and DELL Shared PERC 8

Hello,

We're using ESXi 5.1 successfully on a DELL VRTX system (two server blades with a shared storage).

This system is using a DELL Shared PERC 8 in order to expose the shared storage to the DELL PowerEdge server blades, and we are able to use the shared storage with the VMs.

However, even if the storage is seen as shared by the blades, these are recognizing it as "Local DELL Disk".

This brings up a big problem: we are not able to use other LUN's in RDM mode.
The ESXi servers don't give to us the possibility to use this LUNs (the RDM checkbox is grayed), even if we have already disabled the setting "RdmFilter.HbaIsShared".

Any ideas?

Thanks a lot.