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Interpreting the POST results
About this task
Each time the switch is powered on, rebooted, or reset, the switch performs a power-on self-test (POST).
Total boot time with the POST can be several minutes. The POST can be omitted after subsequent
reboots by using the fastboot command or entering the diagDisablePost command to persistently
disable the POST. The success or failure results of the diagnostic tests that run during POST can be
monitored through LED activity, the error log, or the command line interface. During the POST, the LEDs
flash different colors.
The POST includes the following tasks:
• Conducts preliminary POST diagnostics.
• 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.
Procedure
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
About this task
BOOT includes the following tasks after POST is complete.
Procedure
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.
58 IBM Storage Networking SAN64B-6: SAN64B-6 Installation, Service, and User Guide
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