I have a question about the Microsoft Platform connector: the connector help says that it is possible for the "Percent Disk Busy Time" to go above 100%, but how come this happens?
There used to be links in the connector help to more info, but these no longer work.
Hi Marieke,
See https://serverfault.com/questions/420462/performance-counter-disk-time-and-avg-disk-queue-length.
This behavior can occur because some controllers allow the operating system to use overlapping input/output operations for multiple outstanding requests. The disk performance counters time the responses by using a 100 nanosecond precision counter, and then report the cumulative statistics for a given sample time. This sample time could go over 100 percent if, for example, you have 10 requests that completed in 2 milliseconds each in a 10 millisecond sampling interval. If you have multiple disks in a Raid arrangement, the overlapped input/output happens because the operating system can read and write to multiple disks, and this could show values that are higher than 100 percent for this counter.