Resolving Voltage And Temperature Warnings; Sensor Locations; Power Supply Sensors; Cooling Fan Sensors - HP MSA 2050 User Manual

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 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.
Table 21 Power supply sensor descriptions
Description
Power supply 1
Power supply 2

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 22 Cooling fan sensor descriptions
Description
Fan 1
Fan 2
Fan 3
Fan 4
Event/Fault ID LED condition
Voltage, current, temperature, or fan fault
Voltage, current, temperature, or fan fault
Location Event/Fault ID LED condition
Power supply 1 < 4,000 RPM
Power supply 1 < 4,000 RPM
Power supply 2 < 4,000 RPM
Power supply 2 < 4,000 RPM
for a description of health status icons and alternatives
Resolving voltage and temperature warnings 57