HP StorageWorks MSA 2/8 HP StorageWorks Fabric OS V3.1.x/4.1.x Reference Guide - Page 412

Fabric OS Commands loopPortTest Tests the L_port M->M path on a loop. Synopsis: V3.1.x loopPortTest [passcount, port_number, payload_pattern, pattern_width] Synopsis: V4.1.x loopporttest [--slot number][-nframes count][-ports itemlist][-seed payload_pattern][-width pattern_width] Availability: Admin Release V3.1.x and V4.1.x Description: Use this command to verify the functional operation of the switch by sending frames from port M's transmitter, and looping the frames back using an external fiber cable, including all the devices on the loop, into port M's receiver. This exercises all the switch components from the main board to the SFP to the fiber cable to the SFPs (of the devices and the switch) and back to the main board. The cables and SFPs connected should be of the same technology: that is a short wavelength SFP (switch) port should be connected to another short wavelength SFP (device) port using a short wavelength cable; and a long wavelength port is connected to a long wavelength port; and a copper port is connected to a copper port. Only one frame is transmitted and received at any one time. The port LEDs flicker green rapidly while the test is running. The test method is as follows: 1. Determine which ports are L-ports. 2. Enable ports for cabled loopback mode. 412 Fabric OS Version 3.1.x/4.1.x Reference Guide