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# Host IO Limit by FE metrics

Unisphere collects and displays metrics for host I/O limits (by FE).

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 host I/O limits (by FE).

Table 1. Host IO limit (by FE) metrics
Metric | Description
--- | ---
Host IO Limit % Time Exceeded | Host I/O limit percentage time exceeded
Host IO Limit IOs/sec | The number of I/Os that the FE port is processing
Host IO Limit Throughput | Host I/O limit throughput
Host IO Limit Time Exceeded | Host I/O limit time exceeded

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