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# BE Port metrics

Each storage system director board contains back-end ports.

BE port 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 back-end ports.

Table 1. BE port metrics
Metric | Description
--- | ---
% Busy | The percent of time that the port is busy
Avg IO Size (KB) | The average I/O size - calculated value: (HA Kbytes transferred per sec/total I/Os per sec)
Host lOs/sec | The number of host operations performed each second by the port
Host MBs/sec | The size of the data transfer from the host in MBs per second
MBs Read/sec | The read throughput (MBs) of the port per second
MBs Written/sec | The write throughput (MBs) of the port per second
Reads/sec | The number of read operations performed by the port per second
Speed | Total port capacity
| NOTE: In the REST API, for backward compatibility reasons, this metric is named Max Speed Gb/sec.
Writes/sec | The number of write operations performed each second by the port