Dell PowerEdge EL Manual
Also see for PowerEdge M420: ManualCommand reference guideOwner's manualAdministrator's guideInformation update
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Improving NFS Performance on HPC Clusters with Dell Fluid Cache for DAS35Appendix B: Benchmarks and testsThe iozone benchmark was used to measure sequential read and write throughput (MiB/sec) as well asrandom read and write I/O operations per second (IOPS).The mdtest benchmark was used to test metadata operation performance.B.1. IOzoneYou can download the IOzone from http://www.iozone.org/. Version 3.4.08 was used for these testsand installed the compute nodes.The IOzone tests were run from 1-64 nodes in clustered mode. All tests were N-to-N, that is N clientswould read or write N independent files.Between tests, the following procedure was followed to minimize cache effects:• Unmount NFS share on clients.• Stop the NFS service and unmount the XFS file system on the server.• Mount XFS file system on the server and start the NFS service.• Mount NFS Share on clients.In addition for the cold cache tests described in Section 3.4, the disk managed by Dell Fluid Cache forDAS was disabled and the SSDs that are part of the cache pool were disabled after a write operation.DFC was re-configured prior to the read tests thus ensuring that all reads were from a cold-cache.The following table describes the IOzone command line arguments.IOzone Argument Description-i 0 Write test-i 1 Read test-i 2 Random Access test-+n No retest-c Includes close in the timing calculations-t Number of threads-e Includes flush in the timing calculations-r Records size-s File size |
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