When building or expanding an HPC cluster, one of the biggest architectural decisions is storage design. Many small and mid-sized clusters start with NFS because it is simple, reliable, and easy to manage. But as workloads grow, storage often becomes the hidden bottleneck.

So the real question is:

When is NFS enough, and when does an HPC cluster actually require a parallel file system like Lustre, BeeGFS, or GPFS?

This article breaks down the practical factors that help HPC admins make that decision.

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Understanding the Difference

NFS (Network File System)

NFS is a centralized file-sharing system where compute nodes access data from a single storage server.

Why admins love it

Easy to configure

Minimal infrastructure

Simple backups

Lower operational overhead

Great for small clusters

Common HPC usage

Home directories

Software repositories

Small research workloads

Shared scripts and configuration files

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Parallel File Systems

A parallel file system distributes storage operations across…