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# External Disk metrics

Unisphere collects and displays metrics for external disks.

External Disk 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 disks.

Table 1. External Disk metrics
Metric | Description
--- | ---
% Busy | The percent of time the disk is busy
% Idle | The percent of time the disk is idle
% Used Capacity | The percent of the external disk that is used
Avg Queue Depth | The average queue depth - calculated value: Accumulated queue depth/total SCSI command 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 for the external disk
MBs Read/sec | The read throughput (MBs) of the external disk per second
MBs Written/sec | The write throughput (MBs) of the external disk per second
MBs/sec | The size of the I/O from the host to the external disk per second
Read RT (ms) | The average time that it took the external disk to serve one read command
Reads/sec | The number of host reads per second for the external disk
Response Time (ms) | The average response time for the reads and writes
Total Capacity (GB) | The total capacity of the external disk (GBs)
Unmap Command Count | The unmap command count
Used Capacity (GB) | The used capacity of the external disk (GBs)
Write RT (ms) | The average time that it took the external disk to serve one write command
Writes/sec | The number of host writes per second for the external disk