IBM TotalStorage SAN140M, Installation And Service Manual

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185 Chapter 4: Repair information
Performing channel wrap tests (FICON)
A channel wrap test is a diagnostic procedure that checks
host-to-director FICON 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. At the management server, open the EFC Manager application.
The Products View 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 cursor
is passed over a graphical port 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 or XPM).
• Chassis slot number.
• The consecutive port numbers on the selected card.
c. Double-click the port 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 select Channel Wrap
from the menu. 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 link test at the S/390 host attached to the
configured port. For test instructions, refer to the service
documentation delivered with the S/390 system.