IOPS throughput patterns for oblLoad using the QLogic HBA and the server's embedded TOE were remarkably similar. We observed a very different pattern in IOPS performance, however,  on SLES. More importantly, because of the way the Linux kernel bundles I/O, SLES 10 IOPS performance is invariant with the size of I/O requests—large 64KB I/O requests provided similar IOPS performance as 8KB requests.