Forgive my ignorance, I'm new in this matter. S2750 has grid architecture that permits compute nodes and storage capacity to be added independently. How can I add only storage capacity to S2750? Are there disk shelves that can be connected to the compute nodes or compute nodes must have storage behind (for example G400) to store the backups and the required storage capacity can be added only to this storage? I couldn’t find the answer in the available literature. Thank you!