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59021-08 B 5-1
Section 5
Diagnostics/Troubleshooting
Diagnostic information about the switch is available through the chassis LEDs, the
power supply LEDs, and the Logged-In LED. Diagnostic information is also
available through the SANbox Manager and CLI event logs and error displays.
This section describes two types of diagnostics: Power On Self Test (POST) and
chassis. POST diagnostics describe the Heartbeat LED and the port Logged-In
LED indications. Chassis diagnostics cover power supply and fan diagnostics as
well as over temperature conditions. This section also describes how to use
maintenance mode to recover a disabled switch.
5.1
POST Diagnostics
The switch performs a series of Power On Self Tests (POST) as part of its
power-up procedure. The POST diagnostic program performs the following tests:
Checksum tests on the boot firmware in PROM and the switch firmware in
flash memory
Internal data loopback test on all ports
Access and integrity test on the ASIC
During the POST, the switch logs any errors encountered. Some POST errors are
critical, others are not. The switch uses the Heartbeat LED and the Logged-In
LED to indicate switch and port status. A critical error disables the switch so that it
will not operate. A non-critical error allows the switch to operate, but disables the
ports that have errors. Whether the problem is critical or not, contact your
authorized maintenance provider.
If there are no errors, the Heartbeat LED blinks at a steady rate of once per
second. If a critical error occurs, the Heartbeat LED will show an error blink
pattern. If there are non-critical errors, the switch disables the failed ports and
flashes the associated Logged-In LEDs. Refer to ”Heartbeat LED Blink Patterns”
on page 5-2 for more information about Heartbeat LED blink patterns.