IBM 2498-B40 User Guide - Page 52

POST and boot specifications, POST, Boot, fastboot, diagDisablePost

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Table 5 describes the non-port side LEDs and their behavior. Table 5. Non-port side LED patterns during normal operation LED name LED color Status of hardware Recommended action Power supply / No light fan assembly status PS/fan is not receiving power or is off. Verify the PS/fan is on and seated and the power cord is connected to a functioning power source. Steady green PS/fan is operating normally. No action required. Flashing green PS/fan is faulty. Note: When the switch is first powered on the PS/fan status LED will show flashing green until POST has completed. Check the power cable connection. Verify that the PS/fan is powered on. Replace the PS/fan FRU. POST and boot specifications When the switch is turned on or rebooted, the switch performs 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 diagDisablePost command to persistently disable POST. For more information about these commands, refer to the Fabric OS Command Reference Manual. 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: 1. Conducts preliminary POST diagnostics. 2. Initializes the operating system. 3. Initializes hardware. 4. 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: 1. Performs universal port configuration. 2. Initializes links. 3. Analyzes 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. 26 SAN48B-5 Installation, Service, and User Guide

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Table 5 describes the non-port side LEDs and their behavior.
Table 5. Non-port side LED patterns during normal operation
LED name
LED color
Status of hardware
Recommended action
Power supply /
fan assembly
status
No light
PS/fan is not receiving power or is off.
Verify the PS/fan is on and seated and
the power cord is connected to a
functioning power source.
Steady green
PS/fan is operating normally.
No action required.
Flashing green
PS/fan is faulty.
Note:
When the switch is first
powered on the PS/fan status LED
will show flashing green until POST
has completed.
Check the power cable connection.
Verify that the PS/fan is powered on.
Replace the PS/fan FRU.
POST and boot specifications
When the switch is turned on or rebooted, the switch performs 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
diagDisablePost
command
to persistently disable POST.
For more information about these commands, refer to the
Fabric OS Command
Reference Manual
.
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:
1.
Conducts preliminary POST diagnostics.
2.
Initializes the operating system.
3.
Initializes hardware.
4.
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:
1.
Performs universal port configuration.
2.
Initializes links.
3.
Analyzes 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.
26
SAN48B-5 Installation, Service, and User Guide