Cooling Requirements - Sun Microsystems Enterprise 6500 Reference Manual

Note – The presence of an additional (extra) PCM in the system provides
redundancy and allows hot-plug of PCMs.
TABLE 7-3
Enterprise 5500/4500 Systems
Number Minimum Working Power
of Boards Supplies
1-2 1
3-4 2
5-6 3
7-8 3 + peripheral supply
9-10
11-12
13-14
15-16
1. System needs a fourth PCM for cooling purposes.
2. System needs an eighth PCM for cooling purposes.
Failed power supplies must be replaced as soon as practical. Operating an Enterprise
system without a redundant power supply will result in an outage at the next PCM
failure.
7.4.2

Cooling Requirements

Note – In the Enterprise system, all boards must be adjacent to a PCM. The fans in
the PCM cool the boards. The minimum configuration is one PCM for every two
adjacent boards.
The power supplies incorporate redundant bulk fan electrical power so that the fans
continue to operate in a failed power supply with the redundant fan power from the
peripheral power supply.
Minimum and Redundant Working Power Supplies Required to Power
Active Boards
Redundant Working Power
Supplies (Hot-pluggable)
2
3
4
1
4 + peripheral supply
Enterprise 6500 System
Minimum Working Redundant Working Power
Power Supplies Supplies (Hot-pluggable)
1 2
2 3
3 4
4 5
5 6
6 7
7 8
2
7 8
Chapter 7 Power Supplies 7-9