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# Endpoint metrics

Unisphere collects and displays metrics for iSCSI endpoints.

Within the PM metrics section, V4 is used to denote that the metric is supported only by a storage system (array) running PowerMaxOS 10 (6079). V3 is used to denote that the metric is supported only by a storage system (array) running HYPERMAX OS 5977 or PowerMaxOS 5978. Metrics without the denotation are supported by all storage systems (arrays).

The following table lists all metrics that are available for iSCSI endpoints.

Table 1. Endpoint metrics
Metric | Description
--- | ---
Duplicate Acks Received/sec | Duplicate acknowledgments received per second
Host IOs/sec | The number of host I/O operations performed each second
Packets/sec | Packets per second
Reads/sec | The number of read operations performed each second
Response Time | The average response time for the reads and writes
TCP Retransmits/sec | TCP retransmits per second
Throughput | The amount of data being processed through the endpoint
Total Read Time | Total time spent performing reads
Total Write Time | Total time spent performing writes
Writes/sec | The number of write operations performed each second

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