64 Service Manual (AA-RS2ED-TE, July 2004)

Repair Information

195Director 2/64 Service Manual

Channel Wrap Test (FICON)

A channel wrap test is a diagnostic procedure that checks FICON host-to-director

link connectivity by returning the output of the host as input. The test is host

initiated, and transmits ECHO extended link service (ELS) command frames to a

director port enabled for channel wrapping. The director port echoes the frames

back to the host.

To perform a channel wrap test for a director-attached host:

1. Notify the customer a disruptive channel wrap test will be performed on the

host-to-director FICON link.

2. Open the HAFM application. The View All - HAFM 8 main window displays.

a. Double-click the icon representing the director for which the channel

wrap test will be configured. The Hardware View for the selected director

displays.

b. At the Hardware View, verify the location of the port to be configured for

the channel wrap test. When the mouse pointer is passed over a graphical

UPM card on the front view of the director, the card highlights with a blue

border and a pop-up displays with the following information:

— Port card type (UPM).

— Chassis slot number (0 through 15 inclusive).

— The four consecutive port numbers on the selected card. Valid port

numbers are in the range of 0 through 63 inclusive.

c. Double-click the UPM card with the port to be configured. The Port Card

View for the selected card displays.

d. Right-click the port to be configured, then click Channel Wrap. The

Channel Wrap On for Port n (where n is the port number) window

displays.

e. Click OK to enable channel wrapping for the port.

3. Perform the Fibre Channel link test at the FICON host attached to the

configured port. For test instructions, refer to the service documentation

delivered with the FICON system.