Resolving voltage and temperature warnings
57
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 lower corner of the footer, overall health status of the enclosure is indicated by a health status icon. For
more information, point to the
System
tab and select
View System
to see the System panel. You can select from
Front
,
Rear
, and
Table
views on the System panel. If you point to a component, its associated metadata and
health status displays onscreen.
See
“Options available for performing basic steps” (page 44)
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.
Make sure there is proper air flow, and no cables or other obstructions are blocking the front or rear of the array.
5.
Try replacing each power supply module one at a time.
6.
Replace the controller modules one at a time.
7.
Replace SFPs one at a time (MSA 2050 SAN).
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.
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