Monitoring

Monitoring Performance

This help page provides information on how you can monitor the performance of your array. It contains the following topics:

Overview
Changing Measurement Items
Getting Performance

Overview (back to top)

You can view and monitor the performance in the array from the Monitoring window. When the disk array is monitored, utilization rates of resources in the disk array (such as loads on the disk and ports) can be measured. You can also output the information to a text (.txt) file.

To show Monitoring for the selected array:

From the Arrays window, selected an array to configure.
In the navigation tree, click Performance. The Performance window is displayed.
Click Monitoring. The Monitoring window is displayed.

The Monitoring window shows the items currently selected to monitor or measure
You can enable or disable items you want to include or exclude from monitoring respectively by clicking the Change Measurement Items button. The list of items that may be monitored are described in the following table.

Item	Description
Port Information	Array acquires port I/O and data transfer rates for all. Read and Write commands received from a host. It can also acquire the number of commands that made cache hits and cache-hit rates for all Read and Write commands.
RAID Group & Logical Unit	Information Array acquires all array RAID group pf logical units the I/O and data transfer rates for all Read and Write commands received from a host. In addition, it will also acquire the number of commands that made cache hits and cache-hit rates for all Read and Write commands.
Cache Information	Array can display the ratio of data in a write queue to the entire cache data and utilization rates of the clean, middle, and physical queues. The clean queue consists of a number of segments of data that have been read from the drives and exist in cache. The middle queue consists of a number of segments that retain write data, have been sent from a host, exist in cache, and have no parity data generated. The physical queue consists of a number of segments that retain data, exist in cache, and have parity data generated, but not written to the drives. For the Cache Hit parameter of the Write command, a Hit is defined as a response to the host that has completed a Write to the Cache (Write-After). A Miss is defined as a response to the host that has completed a Write to the drive (Write-Through). When the Cache use volume is large or the battery unit fails, Write-Through is more likely.
Processor Information	Array can acquire and display the utilization rate for each processor.
Drive Information	Array can acquire the I/O and data transfer rates for all Read and Write commands issued to each drive installed in the disk array. It can also acquire the I/O rate of the online verify command executed in each drive.
Drive Operation Information	Array can acquire the drive operation rate and the number of tags. The drive operation time is the period of time from when a command is issued to the drive, to when the command has completed execution. The number of tags is the maximum number of tags per second.
Back-end Information	Array can acquire the I/O and the data transfer rates regarding all Read an Write commands issued to each loop of the back end of the disk array. It can also acquire the I/O rate of the online verify command issued to each loop.