IBM SAN04B-R - System Storage Router, Инструкция по установке, обслуживанию и эксплуатации, Страница: 64 / 103

Interpreting POST results
POST is a system check that is performed each time the router is powered on,
rebooted, or reset, and during which the LEDs flash different colors.
To determine whether POST completed successfully and whether any errors were
detected:
v Verify that the LEDs on the router indicate that all components are healthy (LED
patterns are described in the tables in “Interpreting LED activity” on page 30). If
one or more LEDs do not display a healthy state:
– 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 .
– Follow the recommended action for the observed LED behavior, as listed in
the tables in “Interpreting LED activity” on page 30.
v Verify that diagShow command displays that the diagnostic status for all ports in
the router is OK.
v
Review the system log for errors. 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 Error Message Reference .
POST and boot specifications
The router runs POST by default each time it is powered on. It typically requires
from 1 to 3 minutes to boot and complete POST. POST can be skipped after
subsequent reboots by entering the fastBoot command. For more information
about this command, see the Fabric OS Command Reference Manual .
POST
The success/fail results of the diagnostic tests that run during POST can be
monitored through LED activity, the error log, or a command line interface.
POST includes the following tasks:
1. Running preliminary POST diagnostics
2. Initializing the operating system
3. Initializing the hardware
4. Running 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. Performing universal port configuration
2. Initializing links
3. Analyzing the fabric. If any ports are connected to other switches, the router
participates in a fabric configuration.
4. Obtaining a domain ID and assigning port addresses
5. Constructing unicast routing tables
6. Enabling normal port operation
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SAN04B-R Installation, Service, and User’s Guide