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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
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baseline
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