Files / DiskOpen Entity

The Files / DiskOpen Entity screen presents the MEASURE DiskOpen entity.

The MEASURE DiskOpen entity is I/O activity on a file from an opener process perspective.  One entry is present for every open to a file.

The MEASURE DiskOpen entity does not store the Opener Process Name, only the Opener CPU and Opener PIN .  The Opener Process Name column is derived by looking up the current process name at the CPU  & PIN currently running at that location.

This is an approach to consider when diagnosing disk drive performance issues:

• Drill down starting at the volume level, working down sequentially through the DiskFile, DiskOpen and finally to the process level.

• Starting from the Disk Entity screen, click on a volume and select DiskFile Entity to see all of the active files on the disk.

• On an entry on the DiskFile Entity screen, click to select DiskOpen Entity which displays all of the processes accessing the file.

• On an entry on the DiskOpen screen, click on the Opener Process Name to view Process Detail of the opener process of that file.  (you can also click on the File Name to view the File Entity which provides different I/O counters).