Explanation/Reference:
Explanation:
In a shared storage environment, you must control computer access to iSCSI targets (volumes and snapshots), because multiple computers writing to a target in an uncoordinated manner might result in volume corruption.
When an initiator tries to log in to a target, the group uses access control records to determine if access should be authorized. However, access control records do not prevent multiple initiators, either on the same computer or different computers, from accessing the same target.
Therefore, by default, the group disables multi-host (shared) access to a target. Therefore, only one iSCSI qualified name (IQN) can connect to a target at one time.
Note: You can use Challenge Handshake Authentication Protocol (CHAP) for iSCSI authentication to manage access controls more efficiently. Using a challenge-response mechanism, CHAP restricts target access through user names and passwords instead of unique IP addresses or iSCSI initiator names. You can use CHAP to authenticate iSCSI initiators by specifying a CHAP user name in an access control record. In response, a computer must supply the user name and its password (or "secret") in the initiator configuration interface when logging in to the target.
References: http://psonlinehelp.equallogic.com/V5.0/Content/V5TOC/Multi_Host_access_to_targets.htm