Working with diagnostic features, Viewing post, 9 working with diagnostic features – HP StorageWorks 2.128 SAN Director Switch User Manual

Page 129: 9working with diagnostic features

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Fabric OS 5.x administrator guide 129

9

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 the

offloading of error messages (

supportSave

).

The purpose of the diagnostic subsystem is to evaluate the integrity of the system hardware.
Diagnostics are invoked two ways:

Automatically during the 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 HP StorageWorks Fabric OS 5.x command reference guide for a complete description of

each command.

Viewing POST

By default, when you power on the system, the boot loader performs POST and loads a Fabric OS kernel

image.
POST provides a quick indication of hardware readiness when hardware is powered up. POST does not

require user input to function. It usually completes within several minutes, and supports minimal validation

because of the restriction on test duration. POST performs a basic health check before a new switch joins

a fabric.
POST is consists of 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.
POST1 cannot be bypassed and runs from the boot loader. The factory default configuration is also 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, modify a POST2 test only if directed by your

switch provider’s customer service representative.
You can use the

diagDisablePost

command to disable POST2, and you can reenable it using the

diagEnablePost

command. See the HP StorageWorks Fabric OS 5.x command reference guide for

additional information about these commands.

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