In my experience, Lustre on a typical medium-size (several hundred node) cluster has been more reliable than NFS (at least once the cluster vendor was out of th

In my experience, Lustre on a typical medium-size (several hundred node) cluster has been more reliable than NFS (at least once the cluster vendor was out of the way), and you can actually use it for MPI-IO, which is crucial. It's been quite straightforward to operate, at least with a simple LNET setup. I don't understand this stuff about racehorses. NFS has been easily flattened in various circumstances, too. That said, I'd have chosen PVFS^WOrangeFS at my previous site if I'd had the choice, but I've not been able to make or find a useful performance comparison.