Recovering From A Power Supply Shutdown - Sun Microsystems Sun StorEdge A3500 Manual

7.1 Recovering From a Power Supply
Shutdown
The power supplies have temperature sensors designed to prevent the power
supplies from overheating. If a temperature sensor detects an ambient air
temperature of 70˚C [158˚F] or above, the power supply shuts down. The other
power supply remains on as long as its temperature is below 70˚C [158˚F].
Caution – If the air temperature inside the expansion cabinet is hot enough to cause
!
the power supplies to shutdown, there is a serious problem in the cabinet. Remove
all panels from the cabinet immediately to help cool the controller module and drive
trays. Then do whatever is necessary to alleviate the over-temperature problem
(such as shutting down the power, using external fans to cool the area, and so forth).
Indications of an over-temperature condition are:
One power supply shuts down. Its Power LED is off and the front-panel Power
Supply Fault LED is off.
Both power supplies shut down. All power to the controller module is off, but
the drive trays keep running without fault.
Power supplies power cycle. One or both power supplies shut down, then turn
on again.
High temperature. The air temperature at the back of the controller module is
70˚C [158˚ F] or higher.
Once the air temperature cools to below 70˚C [158˚F], the power supplies will restart.
The controllers will reset, attempt to spin up the disk drives (if needed), and return
to a normal operating state.
You should not need to perform recovery procedures after a power supply
shutdown and restart. However, you can lose data if there is an abrupt power loss to
the controller module, especially if it occurs when data is being downloaded to
cache memory or written to a disk drive.
1. Cool the area to a normal operating temperature, then check the power supplies.
If the power LED on the power supply (or both power supplies) turns on again,
go to Step 2.
If the power supply (or both power supplies) remain off, it may indicate a faulty
power cord (see Section 7.2 "Checking and Replacing Power Cords" on page 7-3),
a failed power supply (see Section 7.3 "Replacing a Power Supply" on page 7-4),
or a failed power interface board (see Section 7.6 "Replacing the Power Supply
Housing (Service Technician Only)" on page 7-11).
7-2 Sun StorEdge A3500/A3500FC Controller Module Guide • August 1999