Brocade Communications Systems VDX 6940 Series, Hardware Installation Manual, Page: 81 / 136

Non-port-side LED patterns during operation (Continued) TABLE 11
LED name LED color Status of hardware Recommended action
Steady amber (for more
than 5 seconds) Fan fault for one of the
following reasons:
• Mismatched airflow on
fan assemblies.
• One or more of the fans
in the fan assembly has
failed.
• The fan assembly was
disabled by the user.
NOTE
When the device is first
powered on, the fan status
LED will show amber until
POST has completed.
Try the following:
• Verify that the airflow
symbol and part
number on the
replacement fan
matches the fans in the
chassis. Replace if
necessary.
• Replace the fan
assembly.
• Verify the fan assembly
is enabled (use the
show environment fan
command). Re-enable
if necessary.
POST and boot specifications
When the device is turned on or rebooted, the device performs a power-on, self-test (POST). Total boot
time with POST can be several minutes. POST can be omitted after subsequent reboots by using the
fastboot command or entering the no diag post command to persistently disable POST.
For more information about these commands, refer to the Network OS Command Reference .
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.
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.
Boot
In addition to POST, boot includes the following tasks after POST is complete:
• Performs port configuration.
• Initializes links.
• Analyzes fabric. If any ports are connected to other devices, the device participates in a fabric
configuration.
• Obtains a domain ID and assigns port addresses.
POST and boot specifications
Brocade VDX 6940 Hardware Installation Guide 81
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