initiator>>>target>>>lun

auto discovery

client
iscsiadm -m discovery -t st -p serverip #发现
iscsiadm -m node -T IQN-TIME-NAME -p serverip -l #连接
连接所有 iscsiadm -m node -L all # -L login
退出所有 iscsiadm -m node -U all # -U out
iscsiadm -m session -o
iscsiadm -m node -o delete all