You can add multiple initiators to an existing volume access group to allow access to volumes in the volume access group with or without requiring CHAP authentication..
You can add multiple initiators to an existing volume access group to enable access to volumes and assign unique CHAP credentials for each initiator within that volume access group. This enables you to apply this option for volume access groups that already exist.
You can assign initator-based CHAP attributes by using an API call. To add a CHAP account name and credentials per initiator, you must use the ModifyInitiator API call to remove and add CHAP access and attributes. For details, see the API reference information.