Product and version information:
The storage device and the application server were on an FC switch connection network as shown in Figure1.
Figure 1 FC switch connection network
When an application server was performing small data block sequential reads to a LUN, the storage performance fluctuated significantly, 37% maximum.
Storage performance fluctuates significantly when Windows 2008 R2 works with QFMA HBAs. It is not recommended that performance-demanding services such as VOD run on such a system. For details about SP1, contact Microsoft technical support personnel.