This document summarizes the results of benchmarks comparing the performance of Lustre 1.8.9, 2.1.6, 2.4.3, and 2.5.1 clients. The benchmarks tested single-thread and multi-thread read and write performance using different client settings for max_rpcs_in_flight and max_dirty_mb. The tests found that the 1.8.9 client performed best for single-thread operations but that the 2.4.3 and 2.5.1 clients could achieve maximum storage throughput when using higher client settings of at least 256 for max_rpcs_in_flight and max_dirty_mb. Checksums had a varying impact on performance