> # About the multi-pid Option

> If the RSCN multi-pid option is enabled, then RSCNs generated to the registered Nx ports may contain more than one affected port IDs. In this case, zoning rules are applied before putting the multiple affected port IDs together in a single RSCN. By enabling this option, you can reduce the number of RSCNs. For example, suppose you have two disks (D1, D2) and a host (H) connected to switch 1. Host H is registered to receive RSCNs. D1, D2, and H belong to the same zone. If disks D1 and D2 are online at the same time, then one of the following applies:

> - The multi-pid option is disabled on switch 1— Two RSCNs are generated to host H, one for the disk D1 and another for disk D2.
> - The multi-pid option is enabled on switch 1— A single RSCN is generated to host H, and the RSCN payload lists the affected port IDs (in this case, both D1 and D2).

> Some Nx ports might not support multi-pid RSCN payloads. If this situation occurs, disable the RSCN multi-pid option.

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