Brocade Communications Systems Extension Switch 7800 - Manual (Page 39)

Brocade 7800 Extension Switch Hardware Reference Manual 27
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Operating the Brocade 7800 Extension Switch
3
Interpreting POST results
POST is a system check that is performed each time the Brocade 7800 is powered on,
rebooted, or reset, and during which the LEDs flash different colors.
Perform the following steps to determine whether POST completed successfully and whether
any errors were detected.
1. Verify that the LEDs on the switch indicate that all components are healthy (LED patterns
are described in Table 4 on page 24 and Table 5 on page 26). If one or more LEDs do not
display a healthy state:
a. Verify that the LEDs are not set to “beacon” (this can be determined through the
switchShow command or Web Tools). For information about how to turn beaconing on
and off, see the Fabric OS Administrator’s Guide or the Web Tools Administrator’s
Guide.
b. Follow the recommended action for the observed LED behavior, as listed in
Table 4 or Table 5 .
2. Verify that diagShow command displays that the diagnostic status for all ports in the
switch is OK.
3. Review the system log for errors. Errors detected during POST are written to the system log,
which is viewed using the errShow command. For more information about this command,
see the Fabric OS Command Reference. For information about specific error messages,
see the Fabric OS Message Reference.
Brocade 7800 maintenance
The Brocade 7800 are designed for high availability and low failure; it does not require any
regular physical maintenance. It includes diagnostic tests and field-replaceable units,
described in the following sections.
Diagnostic tests
In addition to POST, Fabric OS includes diagnostic tests to help you troubleshoot the hardware
and firmware. This includes tests of internal connections and circuitry, fixed media, and the
transceivers and cables in use. The tests are implemented by command, either through a
Telnet session or through a terminal set up for a serial connection to the Extension Switch.
Some tests require the ports to be connected by external cables, to allow diagnostics to verify
the serializer/deserializer interface, transceiver, and cable. Some tests require loop back
plugs.
Diagnostic tests are run at link speeds of 1-Gbps, 2-Gbps, 4-Gbps, and 8-Gbps. For information
about specific diagnostic tests, see the Fabric OS Administrator’s Guide.
NOTE
Diagnostic tests might temporarily lock the transmit and receive speed of the links during
diagnostic testing. Brocade recommends that you power-cycle the switch after completing
offline diagnostics tests.