Dell PowerEdge External Media System 1434 Improving NFS performance on HPC clu - Page 20

Improving NFS Performance on HPC Clusters with Dell Fluid Cache for DAS IOPS Figure 8. Random read performance 140000 120000 100000 80000 60000 40000 20000 0 1 Random reads 2 4 8 16 32 48 64 Number of concurrent clients baseline DFC-WB DFC-WT 3.3. Metadata tests This section presents the results of metadata tests using the mdtest benchmark. In separate tests, one million files were created, stated and unlinked concurrently from multiple NFS clients on the NFS server. These results are presented in Figure 9, Figure 10, and Figure 11, respectively, as the number of metadata operations per second. Each client ran a single instance of the mdtest benchmark for test cases from 1 to 64 clients. For 128, 256 and 512 concurrent client tests, each client ran 2, 4, and 8 threads of the benchmark. From the figures it can be seen that DFC-WT and DFC-WB create and remove tests have similar performance. This indicates that the metadata tests are not bandwidth sensitive. If they were, the WT tests would be expected to outperform the WB tests. This result needs further analysis. It is likely that these operations are more latency sensitive. 20