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Improving NFS Performance on HPC Clusters with Dell Fluid Cache for DAS

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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.

Figure 8.

Random read performance

Random reads

Number of concurrent clients

baseline

DFC-WB

DFC-WT