Using InfiniBand network fabrics to allocate globally shared memory for processes on different nodes

Dear Collegues,

My MPI program implements a globally shared memory for processes on multiple nodes (hosts) using MPI_Win_allocate_shared, MPI_Comm_split_type functions calls. Unfortunately, the memory address space allocated is not actually shared between processes on different nodes. I'm wondering what will actually happen if I run my MPI program on a cluster with InfiniBand network and change the network fabrics to I_MPI_FABRICS=shm:dapl or something like that. Is this can be a solution of the following problem ?

Thanks in advance.

Cheers, Arthur.