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14 Sun SNMP Management Agent Addendum for the Netra 440 Server • April 2004
Fans and Fan Trays
The Netra 440 server fans in the fan trays are identified in the ENTITY-
MIB::entPhysicalTable by the entPhysicalDescr of Fan number, where number is a
number in the range from 0 to 3. The fans are represented in the following tables that
extend the entPhysicalTable:
■ SUN-PLATFORM-MIB::sunPlatEquipmentTable
■ SUN-PLATFORM-MIB::sunPlatFanTable
Note – The fans in fan trays 0-2 have certain sensors that give status and failure
information, whereas the fan in fan tray 3 does not; therefore, the information in the
remainder of this section will apply only to the fans in fan trays 0-2, not the fan in
fan tray 3. Also, if the fan in fan tray 3 fails, the Netra 440 server automatically shuts
down and no SNMP traps are generated.
The fans in fan trays 0-2 contain a tachometer used to indicate the current speed of
the fan expressed in revolutions per minute (RPM). The tachometers are identified
by their entPhysicalDescr of Fan number Tachometer, where number is a number in
the range from 0 to 2 corresponding to the fan tray being monitored. The fan
tachometers are represented in the following tables that extend the entPhysicalTable:
■ SUN-PLATFORM-MIB::sunPlatEquipmentTable
■ SUN-PLATFORM-MIB::sunPlatSensorTable
■ SUN-PLATFORM-MIB::sunPlatNumericSensorTable
Fan Failures
If the speed of a fan falls below the threshold indicated by its tachometer's
sunPlatNumericSensorLowerThresholdNonCritical value, the fan is considered to
have failed and the following will occur:
■ The sunPlatEquipmentOperationalState value for the fan will change from
enabled(2) to disabled(1) and a sunPlatStateChange trap will be generated
with the form shown in
TABLE 2.
■ A sunPlatEnvironmentalAlarm trap with a sunPlatNotificationPerceivedSeverity
value of warning(5) will be generated for the fan with the form shown in
TABLE 3.
■ The sunPlatEquipmentAlarmStatus value for the fan will change from
cleared(7) to warning(5) and a sunPlatAttributeChangeInteger trap will be
generated with the form shown in
TABLE 4.