Note:
While not recommended, POST can be omitted after subsequent reboots by
using the
fastBoot
command or entering the
diagDisablePost
command to
persistently disable POST.
For more information about these commands, refer to the
Fabric OS Command
Reference
.
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 (see
“Interpreting LEDs” on page 31). 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
the tables in “Interpreting LEDs” on page 31.
2.
Verify that the switch prompt displays on the terminal of a computer
workstation that is connected to the switch. If the prompt does not display
when POST completes, press
Enter
. If the prompt still does not display, open
another Telnet session or access the switch through another management tool.
If this is not successful, the switch did not successfully complete POST. Contact
your IBM representative.
3.
Using either Web Tools or the CLI, verify that the diagnostic status for all ports
in the switch is OK.
v
If using Web Tools, select
Port Admin
or
Status
to display information about
the ports.
v
If using the CLI, use the
diagShow
command
4.
Review the system log for errors.
v
If using Web Tools, errors are listed under
Switch Events
v
If using the CLI, 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
Diagnostic testing
In addition to POST, the Fabric OS includes diagnostic tests to troubleshoot the
hardware and firmware. This includes tests of internal connections and circuitry,
fixed media, and the transceivers and cables. The tests are implemented by
command, either through a Telnet session or through a terminal set up for a serial
connection to the 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 loopback plugs.
Diagnostic tests are run at link speeds of 1 Gbps, 2 Gbps, 4 Gbps, and 8 Gbps. For
information about diagnostic tests, refer to the
Fabric OS Administrator’s Guide
.
Chapter 3. Using and maintaining the switch
35
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