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 the iSCSI session. Ending the iSCSI session forces the initiator
off the storage array. 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 array and you see that initiators are still logged on, you can end the iSCSI session
to get the initiators off the storage array. This action causes the storage array to warn the initiators that the system will
remove storage array access if they do not log out within five seconds.