Brocade Communications Systems ICX 7250, Hardware Installation Manual

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Fan detection and error checking policies
During system startup and operation, the Brocade ICX 7250, checks the fan status and automatically performs corrective actions and
generates syslog messages if a problem is detected (refer to the following table).
If the Brocade ICX 7250 determines that there is a problem with the fans, it performs the following actions and generates the following
syslog messages, as shown in the following table.
NOTE
To determine the fan direction (either front to back, or back to front), enter the show chassis command.
TABLE 14 Brocade ICX 7250 fan error detection and resolution
Issue detected Attempted resolution
During system bootup, no fan is detected The system immediately shuts down.
During system bootup, fewer fans than required for
normal operation are detected The system boots up normally and follows the fan speed and shutdown policy as described in
Temperature threshold levels on page 93. A syslog message is generated that describes the
issue.
System boots up normally, but all fans fail during
system operation The system immediately shuts down. A syslog message describing the issue is generated prior
to shutdown.
After system bootup, fewer fans than required for
normal operation are detected No action is performed. The system follows the fan speed and shutdown policy as described in
Temperature threshold levels on page 93. A syslog message is generated that describes the
issue.
After system bootup, two of the power supply fans
are detected as operating in opposite directions No action is performed. The system follows the fan speed and shutdown policy as described in
Temperature threshold levels on page 93. A syslog message is generated that describes the
issue.
After system bootup, two of the module fans are
detected as operating in opposite directions No action is performed. The system follows the fan speed and shutdown policy as described in
Temperature threshold levels on page 93. A syslog message is generated that describes the
issue.
After system bootup, the power supply and module
fans are detected as operating in opposite directions No action is performed. The system follows the fan speed and shutdown policy as described in
Temperature threshold levels on page 93. A syslog message is generated that describes the
issue.
During normal system operation, one of the module
fans reports that it is operating in the incorrect
direction No action is performed. The system follows the fan speed and shutdown policy as described in
Temperature threshold levels on page 93. A syslog message is generated that describes the
issue.
During normal system operation, the system detects
that a power supply or module fan has been
replaced, and the new fan is operating in the
incorrect direction No action is performed. The system follows the fan speed and shutdown policy as described in
Temperature threshold levels on page 93. A syslog message is generated that describes the
issue.
System detects that the critical (shutdown)
temperature has been exceeded The system generates a syslog message when the issue is detected, and every 30 seconds
after detection. If the critical (shutdown) temperature is exceeded for two minutes, the system
shuts down.
Shutdown reset time and syslog message
When the temperature crosses the critical (shutdown) threshold levels, the device will reset after 5 minutes. The following console and
syslog message is displayed:
!!! Temperature is over shutdown level, please shutdown your stack unit 1 to avoid hw damage!!!
NOTE
Brocade recommends that you shut down your stack unit to avoid any hardware damage.
Managing an ICX 7250 Device
Brocade ICX 7250 Switch Hardware Installation Guide
94 53-1003898-02