Hello, I am wondering if I can get help with an error I am receiving when using MPI IO. I was referred here by openmpi saying that this was a possible ROMIO bug. I am receiving the following error Error in ADIOI_Calc_aggregator(): rank_index(40) >= fd->hints->cb_nodes (40) fd_size=213909504 off=8617247540 Error in ADIOI_Calc_aggregator(): rank_index(40) >= fd->hints->cb_nodes (40) fd_size=213909504 off=8617247540 application called MPI_Abort(MPI_COMM_WORLD, 1) - process 157 application called MPI_Abort(MPI_COMM_WORLD, 1) - process 477 This is happening I BELIEVE when the code I am using is writing an ensight gold format file for a large problem that I am running on 640 cores. I can provide more information if need be. I am using openmpi 1.8.7, but I have tried mvapich2 version 1.9 with the same error code, which are the two current mpi files on the cluster that I am using.