You may experience disk I/O performance issues if your server contains an Intel Xeon Westmere-EX (10 Core) processor
This can occur because some of the I/O completion port objects are not cache-aligned. This behavior is whatĀ causes poor disk I/O performance.
You can resolve the issue by updating Ntoskrnl.exe andĀ Ntkrnlpa.exe updated versions are available for download from http://support.microsoft.com/kb/2545635