This page comments on general aspects related to workloads on Mogon I/II, more information with respect to filesystems can be found here.
Scientific applications perform I/O to parallel file system in primarily one of two ways:
Currently, when suspecting I/O problems you should address the HPC-team. There is no straight forward method available to analyze I/O problems on the user level (of third party applications).
We may provide more tools in the foreseeable future.
The statements above may seem a little abstract, particularly when third-party applications have to be used and no decision can be made about the application architecture.
However, a few rules of thumb can be given: