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In the Storage Performance Requirements section, there are several high-level performance metrics that storage systems must meet to qualify as a DGX SuperPOD solution. Current testing requires that the solutions meet the “Best” criteria discussed in the table. In addition to these high-level metrics, several groups of tests are run to validate the overall capabilities of the proposed solutions. These include single-node tests where the number of threads is varied and multi-node tests where a single thread count is used and the number of nodes vary. In addition, each test is run in both Buffered and DirectIO modes and when I/O is performed to separate files.
Four different read patterns are run. The first read operation is sequential where no data is in the cache. The second read operation is run immediately thereafter to evaluate the ability for the file system to cache data. The cache is purged and then the data are read again, this time randomly. Lastly, the data is re-read again randomly, to evaluate data caching.