Target prescan and rescan enables you to discover the available target and LUN information on the network without requiring a host server to be bound to the Oracle Fabric Interconnect. Use this feature to determine if the list of targets and LUNs is satisfactory, or require any removals or additions, before committing them (binding) to a host-server profile. Oracle Fabric OS then supports binding the server profile with the phys-con after a prescan is complete.
The Oracle fabric interconnect relies on FC's RSCN to send target-state updates from the remote switch to the fabric interconnect. The fabric interconnect's FC module accepts the update and notifies the host server of any changes. By default, RSCN is turned off on some FC switches.
RSCN does not support reporting LUN state changes (add or remove). To compensate for this RSCN limitation, you must manually run rescan for a vHBA to detect any LUN level changes.