But Isilon is purely NFS (and/or SMB/CIFS) and doesn't support the parallel access that GPFS or Lustre do. It's not really a choice for this workload. Plus it'd be a lot more expensive than HPC storage - enterprise level RAS (reliability, serviceability, availability) costs. I've seen comparable capacity Isilon & DDN quotes (w/GPFS or Lustre) and they're worlds apart.