HP MSA 2040 SAN Storage - Manual (Page 65)

Resolving voltage and temperature warnings 65
Resolving voltage and temperature warnings
1. Check that all of the fans are working by making sure the Voltage/Fan Fault/Service Required LED on
each power supply is off, or by using the SMU to check enclosure health status. In the Configuration
View panel, right-click the enclosure and select View > Overview to view the health status of the
enclosure and its components. The Enclosure Overview page enables you to see information about
each enclosure and its physical components in front, rear, and tabular views—using graphical or
tabular presentation—allowing you to view the health status of the enclosure and its components.
See
"Options available for performing basic steps" (page 51) for a description of health status icons
and alternatives for monitoring enclosure health.
2. Make sure that all modules are fully seated in their slots with latches locked.
3. Make sure that no slots are left open for more than two minutes.
If you need to replace a module, leave the old module in place until you have the replacement or use a
blank module to fill the slot. Leaving a slot open negatively affects the airflow and can cause the
enclosure to overheat.
4. Try replacing each power supply module one at a time.
5. Replace the controller modules one at a time.
Sensor locations
The storage system monitors conditions at different points within each enclosure to alert you to problems.
Power, cooling fan, temperature, and voltage sensors are located at key points in the enclosure. In each
controller module and expansion module, the enclosure management processor (EMP) monitors the status
of these sensors to perform SCSI enclosure services (SES) functions.
The following sections describe each element and its sensors.
Power supply sensors
Each enclosure has two fully redundant power supplies with load-sharing capabilities. The power supply
sensors described in the following table monitor the voltage, current, temperature, and fans in each power
supply. If the power supply sensors report a voltage that is under or over the threshold, check the input
voltage.
Cooling fan sensors
Each power supply includes two fans. The normal range for fan speed is 4,000 to 6,000 RPM. When a
fan speed drops below 4,000 RPM, the EMP considers it a failure and posts an alarm in the storage system
event log. The following table lists the description, location, and alarm condition for each fan. If the fan
speed remains under the 4,000 RPM threshold, the internal enclosure temperature may continue to rise.
Replace the power supply reporting the fault.
During a shutdown, the cooling fans do not shut off. This allows the enclosure to continue cooling.
Table 21 Power supply sensor descriptions
Description Event/Fault ID LED condition
Power supply 1 Voltage, current, temperature, or fan fault
Power supply 2 Voltage, current, temperature, or fan fault
Table 22 Cooling fan sensor descriptions
Description Location Event/Fault ID LED condition
Fan 1 Power supply 1 < 4,000 RPM
Fan 2 Power supply 1 < 4,000 RPM
Fan 3 Power supply 2 < 4,000 RPM
Fan 4 Power supply 2 < 4,000 RPM