13Working With Diagnostic Features; About Fabric Os Diagnostics; Viewing Power-On Self Test - HP A7533A - Brocade 4Gb SAN Switch Base Administrator's Manual

13 Working with Diagnostic Features
This chapter provides information on diagnostics and how to display system, port, and specific hardware
information. It also describes how to set up system logging mapping (syslogd) and how to set up
offloading error messages (supportSave).

About Fabric OS diagnostics

The purpose of the diagnostic subsystem is to evaluate the integrity of the system hardware.
Diagnostics are invoked in the following two ways:
• Automatically during the power-on self test (POST)
• Manually using Fabric OS CLI commands
The error messages generated during these test activities are sent to the serial console and system message
logs, whose output formats may differ slightly.
Use the diagHelp command to receive a list of all available diagnostic commands.
See the Fabric OS Command Reference for a complete description of each command.

Viewing power-on self test

By default, when you power on the system, the boot loader automatically performs power-on self tests and
loads a Fabric OS kernel image.
The POST tests provide a quick indication of hardware readiness when hardware is powered up. These
tests do not require user input to function. They typically operate within several minutes, and support
minimal validation because of the restriction on test duration. Their purpose is to give a basic health check
before a new switch joins a fabric.
These tests are divided into two groups: POST1 and POST2. POST1 validates the hardware interconnect of
the device, and POST2 validates the ability of the device to pass data frames between the ports. The
specific set of diagnostic and test commands run during POST depends on the switch model.
The factory default configuration is set to run POST2, but you can configure your switch to bypass POST2,
which runs after the kernel image has started but before general system services such as login are enabled.
Although each test performed during POST2 is configurable, you should only modify a POST2 test if
directed by your switch provider's customer service representative.
You can use the diagDisablePost command to disable both POST1 and POST2, and you can reenable
it using the diagEnablePost command. See the Fabric OS Command Reference for additional
information about these commands.
The following example shows a typical boot sequence, including POST messages:
The system is coming up, please wait...
Read board ID of 0x80 from addr 0x23
Read extended model ID of 0x16 from addr 0x22
Matched board/model ID to platform index 4
PCI Bus scan at bus 0
:::
:::
Checking system RAM - press any key to stop test
Checking memory address: 00100000
System RAM test using Default POST RAM Test succeeded.
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