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Replacing a power supply
Attention: Before you replace a power supply, consider the following factors:
v Each power supply has a built-in sensor that detects the following conditions:
– Overvoltage
– Overcurrent
– Overtemperature
If any of these conditions occur, one or both power supplies enter shutdown
mode. All power remains off until one of the following events occurs:
– You cycle the power switches (turn off the power switches, wait at least 30
seconds, then turn on the power switches). For more information, see
“Recovering from an overtemperature condition and power supply shutdown”
on page 139.
– The power supplies automatically resume operation when the ambient air
temperature cools to below 70° C (158° F). When the power supplies
automatically resume operation, the DS4500 Storage Subsystem also
resumes operation.
v
You can hot swap (replace) a power supply because the two power supplies
provide redundancy.
v Both power supplies have built-in temperature sensors designed to prevent the
power supplies from overheating. If a temperature sensor detects an ambient air
temperature greater than 70° C (158° F), the “overheated” power supply
automatically shuts down. The second power supply remains on as long as its
temperature remains below 70° C (158° F). If the second power supply
overheats, it turns off all power to the DS4500 Storage Subsystem.
Note: There is a serious problem if the air temperature inside the rack cabinet is
hot enough to cause the power supplies to shut down.
v The DS4500 Storage Subsystem is capable of power-up recovery without
operator intervention. Once the air temperature cools to below 70° C (158° F),
the power supplies automatically restart. An automatic restart resets the
controllers, attempts to restart the hard disk drives, which has no effect on the
hard disk drives if they are already running, and returns the DS4500 to normal
operation.
v When a power supply fails, the green power LED on the power supply goes off
and the amber power supply fault LED is lit on the front of the DS4500 Storage
Subsystem. For more information, see “Power supply LED” on page 133 and
“Front Bezel LEDs” on page 127.
v If you replace the power supply CRU and still experience problems, the DS4500
Storage Subsystem might have defective components or connections. Check the
storage-management software for indications of other component failures.
When
instructed by the storage-management software, replace a power supply by
using the following procedure:
1. Check the power supply LED on the back of the DS4500 Storage Subsystem,
as shown in Figure 106 on page 157. Be sure that the green power indicator
light on the failed power supply is off.
156 IBM TotalStorage DS4500 Fibre Channel Storage Subsystem: Installation, User’s, and Maintenance Guide