Brocade Communications Systems SilkWorm 2400, Hardware Reference Manual, Page: 26 / 42

Chapter 3 Diagnostics
3-2
Diagnostic Overview
The switch is designed for maintenance free operation. When there is a suspected failure,
the switch has self diagnostic capabilities to aid in isolating any equipment or Fabric
failures.
The switch supports Power-On Self-Tests (POSTs) and diagnostic tests. The diagnostic
tests determine the switch’s status and isolates problems and are run via telnet
commands. For more information on diagnostic testing commands and procedures, see
the Fabric Operating System Version 2.0 Manual.
Verifying Power-On Self-Test (POST)
When powering on a switch, the switch conducts a series of diagnostic tests including:
■
Dynamic RAM Test
■
Port Register Test
■
Central Memory Test
■
CMI Connector Test
■
CAM Test
■
Port Loop Back Test
Should the switch fail to complete POST successfully, the green power LED will be set
to blink. This is an indication of a fault in one of the initial stages of POST and indicates
that the CPU is not able to bring up the operating environment. Should this condition
occur, the switch should be returned for repair.
If a serial link is connected to the SilkWorm 2400 switch on initial power up, the switch
type will be printed to the terminal screen, followed by the message ‘Starting RAM test’.
On completion of the RAM test, the OS is loaded into CPU memory and the operating
environment is then booted. (A RAM test failure will result in the power LED to blink).
If the switch can completely boot the operating system, but other errors are encountered
during POST, these errors will be logged in the system error log. A Telnet session or
serial link connection to the switch will enable viewing of the error log. [See the Fabric
OS Reference Manual diagnostic and telnet commands for a description of the errShow
command and details on running diagnostics.]
Removing Power
NOTE:
Error messages are stored in RAM and are lost when power is
removed from the switch. Access the error message log to view and
note any error messages before removing power from the switch.