Servicing Power Supplies
A CMIOU chassis contains six power supplies. For the location of these power supplies, see
“CMIOU Chassis Front Components” on page 20.
A switch chassis contains four power supplies (SPARC M7-16). For the location of these power
supplies, see “Switch Chassis Front Components (SPARC M7-16)” on page 23.
Note - To ensure that the server is properly cooled, the switch chassis must have at least three
working power supplies. If power is removed from one of the power grids for the server, which
effectively removes power from two of the power supplies in the switch chassis, the remaining
two active power supplies will provide power to all four power supply fans in the chassis.
The power supplies are 2N redundant. In the event that a power supply fails in either chassis,
the system can operate with only three power supplies in the switch chassis or five power
supplies in the CMIOU chassis.
There are no restrictions into which slots the power supplies have to be installed. You can install
them in any of the power supply slots.
Caution - The SPARC M8-8 server includes power supplies that are not compatible with the
SPARC M7 servers. Never install a SPARC M8 power supply in a SPARC M7 server, and never
install a SPARC M7 power supply in the SPARC M8-8 server. The SPARC M8 power supplies
include three shims installed on one side of the power supply (see “Remove the Power Supply
Shims (SPARC M8)” on page 170).
These topics explain how to service the power supplies in the server.
Description Links
Learn about the power supply LEDs. “Power Supply LEDs” on page 166
Remove the power supply. “Remove a Power Supply” on page 167
“Install a Power Supply” on page 175
For SPARC M8 power supplies only,
move shims from faulty power supply to
replacement power supply
“Install the Power Supply Shims (SPARC M8)” on page 172
“Remove the Power Supply Shims (SPARC M8)” on page 170
Servicing Power Supplies 165
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