Symantec Storage Foundation 6.0.1 (VXFS file system) performance degradation

Issue

• IO performance degradation is observed for systems installed with Symantec Storage Foundation (SF) 6.0.1 compared with previous SF VXFS file system versions
• IO performance degradation will be noticed for bulk IO operations
• Performance degradation is seen after upgrade from SF 5.1SP1RP3 to SF 6.0.1 on Linux
• The degradation in performance is seen because the I/O are not unplugged before getting delivered to lower layers in the IO path. These I/Os are unplugged by OS at a default time which 3 milli seconds, which resulted in an additional overhead in completion of I/Os.