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# External Disk Group metrics

Unisphere collects and displays metrics for external disk groups.

External Disk Group metrics are supported only by storage systems (arrays) running HYPERMAX OS 5977 or PowerMaxOS 5978.

The following table lists all metrics that are available for external disk groups.

Table 1. External Disk Group metrics
Metric | Description
--- | ---
% Busy | The percentage of time the disk group is busy
% Idle | The percentage of time the disk group is idle
% Used Capacity | The percentage of the disk group capacity that is allocated
Avg Queue Depth | The average queue depth - calculated value: Accumulated queue depth/total SCSI commands per sec
Avg Read Size (KB) | The average number of kilobytes for a single read command
Avg Write Size (KB) | The average number of kilobytes for a single write command
IOs/sec | The total number of read and write I/Os per second
MBs Read/sec | The read throughput (MBs) of the disk group per second
MBs Written/sec | The write throughput (MBs) of the disk group per second
MBs/sec | The total number of MBs per second for the disk group
Members | The number of members in the external disk group
Read RT (ms) | The average time that it took the disk group to serve one read command
Reads/sec | The number of reads per second for the disk group
Response Time (ms) | The average response time for the reads and writes
Total Capacity (GB) | The total capacity of all the disks in the disk group
Unmap Command Count | Unmap command count
Used Capacity (GB) | The total capacity allocated for all the disks in the disk group
Write RT (ms) | The average time that it took the disk group to serve one write command
Writes/sec | The number of writes per second for the disk group