You might want to end an iSCSI session for these reasons:
Unauthorized access – If an is logged on whom you deem should not have access, you can end the iSCSI session. Ending the iSCSI session forces the initiator
off the storage subsystem. The initiator might have been able to log on because of the None authentication method being available.
System downtime – If you need to take down a storage subsystem and you see that initiators are still logged on, you can end the iSCSI session
to get the initiators off the storage subsystem. This action causes the storage subsystem to warn the initiators that the
system will remove storage subsystem access if they do not log off within five seconds.