Hello moe2197,  This determines how persistent FCIDs that are not in use behave with the purge command. Dynamic entries are deleted, static entries are not deleted. There is a section in the MDS CLI guide titled "About Persistent FCID Selective Purging" that may help. The aim will be to purge stale entries, in order to obtain more free entries. This use case is discussed in another document (not the CLI guide) - "System Messages and Recovery Pocedures for the Cisco MDS 9000 Family" - the system/error message in question being "FCDOMAIN-5-FCID_PERSISTENT_TBL_HALF_FULL".  Best regards, Richard.
Can anyone clearly explain the difference between static and dynamic persistency / assignment when creating persistent fcids on mds?  I'm not asking about persistent fcids or static domains or enabling persistent fcids on a vsan ... I'm talking about an already persistent fcid that has an assignment of "dynamic" vs. one that has an assignment of "static" ... or creating a new persistent fcid and selecting "dynamic" or "static" as the assignment type. What's the difference?
Static vs. dynamic persistency / assignment (FCID)