Devices

The Devices window shows information about the devices activity. 

The grid located at the top of the window shows each individual device with the following information for each one:

Device Name Logical name of the device
Physical Name Full hierarchic file name of the device
Reads (APF exclude) /s Number of reads from the device (excluding APF) per second
APF Reads /s Number of APF reads from the device per second
Writes/s Number of writes to the device per second
Waiting Time (ms/s) Ratio of time (in milliseconds per second) spent waiting for I/O requests to be satisfied
Tasks Waiting/s Number of tasks forced to wait for synchronization of an I/O request per second
IO requests/s Number of I/O requests per second
Space allocated (MB) Allocated space in MBytes
Space Total (MB) Total device space in MBytes

By default, the last snapshot is displayed in the grid. Use the slidder (or the arrow buttons) located at the top of the grid to navigate through the collected snapshots. In monitoring, the "Update" button must be unchecked to be able to navigate through the collected snapshots.

Select one or more devices in the grid (Check box at the left of the grid) to update the graphes located at the bottom of the window. If several devices are selected, the statistics are aggregated.

Reads and Writes /sec

Reads (APF exclude) /s Number of reads from the device (excluding APF) per second
APF Reads /s Number of APF reads from the device per second
Writes/s Number of writes to the device per second

Waiting Time (ms/sec)

Ratio of time (in milliseconds per second) spent waiting for I/O requests to be satisfied

Tasks Waiting /sec

Number of tasks forced to wait for synchronization of an I/O request per second

IO Requests /sec

Number of I/O requests per second

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