1. The iSCSI application initiates a TCP layer three-time chain establishment request;
2. After the third link establishment process succeeds, the iSCSI initiator initiates a login request for the discovery session. The request is a short connection. The purpose is to obtain the name of the target. After the success is successful, the initiator initiates a broken request.
3. The iSCSI initiator initiates the login request of the normal session again. The interaction parameters of the two ends are negotiated. After the normal session is established successfully, the normal connection is maintained.
4. After the iSCSI channel is successfully established, the host and the storage can perform IO read and write interaction.



