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• Initializes the operating system.
• Initializes hardware.
• Runs diagnostic tests on several functions, including circuitry, port functionality, memory, statistics
counters, and serialization.
Perform the following steps to determine whether POST completed successfully and whether any errors
were detected.
1. Verify that the LEDs on the device indicate that all components are healthy. 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).
b) Follow the recommended action for the observed LED behavior.
2. Verify the diagShow command displays that the diagnostic status for all ports in the device is OK.
3. Review the system log for errors. Errors detected during POST are written to the system log, which can
be viewed by using the errShow command.
Interpreting the BOOT results
BOOT includes the following tasks after POST is complete.
1. Performs universal port configuration.
2. Initializes links.
3. Analyzes the fabric. If any ports are connected to other switches, the switch participates in a fabric
configuration.
4. Obtains a domain ID and assigns port addresses.
5. Constructs unicast routing tables.
6. Enables normal port operation.
Running diagnostic tests
In addition to the 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 device. 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 supported link speeds depending on the speed of the link being tested and the
type of port.
Note: Diagnostic tests may temporarily lock the transmit and receive speed of the links during diagnostic
testing.
Brocade recommends that you power-cycle the device after completing offline diagnostics tests.
54 IBM Storage Networking SAN128B-7: SAN128B-7 Installation, Service, and User Guide
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