HP StorageWorks MSA 2/8 HP StorageWorks Fabric OS V3.1.x/4.1.x Reference Guide - Page 168

Fabric OS Commands -lb_mode mode (V4.1.x only) -spd_mode mode (V4.1.x only) Select the loopback point for the test. By default, crossporttest uses cable loopback as described above. However for debug purposes you can select other loopback modes as follows: 0 Cable Loopback. 1 Port Loopback (loopback plugs). 2 External (series) loopback. 3 Silkscreen loopback. 4 Serial link wrapback. 5 Internal (parallel) loopback. Select the speed mode for the test. This parameter is only used for 2-Gbps capable products where it controls the speed at which each port is operated. For 1-Gbps only products it is ignored. The exact operation of modes 3-6 depends upon the loopback mode selected. When speed modes 3-6 are used with cables, they must be connected even to odd or the test will fail. 0 - set all ports' speed for auto-negotiate 1 - set all ports' speed to lock at 1 Gbps 2 - set all port's speed to lock at 2 Gbps For -lb_mode set to 0, one of the following speed modes are available to test the speed negotiation: 3 - set all even ports speed for AN, set all odd ports speed for 1 Gbps. 4 - set all even ports' speed for AN, set all odd ports' speed for 2 Gbps. 5 - set all odd ports' speed for AN, set all even ports' speed for 1 Gbps. 6 - set all odd ports' speed for AN, set all even ports' speed for 2 Gbpsc. For -lb_mode set to 2, the following speed modes are available to test FIFO underrun: 3,5 - set all even ports' speed for 2 Gbps, set all odd ports' speed for 1-Gbps. 4,6 - set all even ports' speed for 1 Gbps, set all odd ports' speed for 2 Gbps 168 Fabric OS Version 3.1.x/4.1.x Reference Guide