> # Flow Statistics

> Flow statistics count the ingress traffic in the aggregated statistics table. You can collect two kinds of statistics:

> - Aggregated flow statistics to count the traffic for a VSAN.
> - Flow statistics to count the traffic for a source and destination ID pair in a VSAN.

> If you enable flow counters, you can enable a maximum of 1 K entries for aggregate flow and flow statistics. Be sure to assign an unused flow index to a module for each new flow. Flow indexes can be repeated across modules. The number space for flow index is shared between the aggregate flow statistics and the flow statistics.

> Generation 1 modules allow a maximum of 1024 flow statements per module. Generation 2 modules allow a maximum of 2048-128 flow statements per module.

> Table 7-1 explains the Flow Type radio button that defines the type of traffic monitored.

> Table 7-1 Performance Manager Flow Types
> Flow type | Description
> --- | ---
> Host->Storage | Unidirectional flow, monitoring data from the host to the storage element
> Storage->Host | Unidirectional flow, monitoring data from the storage element to the host
> Both | Bidirectional flow, monitoring data to and from the host and storage elements

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