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Improving NFS Performance on HPC Clusters with Dell Fluid Cache for DAS This Dell technical white paper explains how to improve Network File System I/O performance by using Dell Fluid Cache for Direct Attached Storage in a High Performance Computing Cluster. Garima Kochhar Dell HPC Engineering March 2013, Version 1.0

Section	Page
Executive Summary	5
1. Introduction	6
1.1. Dell Fluid Cache for DAS (direct-attached storage)	6
2. Solution design and architecture	6
2.1. NFS storage solution (baseline)	7
2.2. Dell Fluid Cache for DAS based solution	9
2.3. I/O clients test bed	10
2.4. Solution tuning	12
2.4.1. Storage	13
2.4.2. NFS server	13
2.4.3. Dell Fluid Cache for DAS	14
2.5. Tracking solution health and performance	14
2.5.1. Server health and monitoring	14
2.5.2. Dell PowerEdge Express Flash PCIe SSD health and monitoring	14
2.5.3. Dell Fluid Cache for DAS health and monitoring	16
3. Performance	16
3.1. Sequential writes and reads	17
3.2. Random writes and reads	19
3.3. Metadata tests	20
3.4. Cold-cache tests	22
4. Conclusion	25
5. References	25
Appendix A: Step-by-step configuration of Dell Fluid Cache for NFS	27
A.1. Hardware checklist and cabling	27
A.2. NFS server set up	28
A.3. NFS server configuration and tuning	29
A.4. Virtual disk configuration	31
A.5. XFS and DFC configuration	33
A.6. Useful commands and references	34
A.7. Performance tuning on clients	34
Appendix B: Benchmarks and tests	35
B.1. IOzone	35