Server User Manual

7-10 UltraEnterprise6000/5000/4000 Systems Manual—November1996
7
Failed power supplies must be replaced as soon as practical. Otherwise, the
Enterprise system will lose its redundancy and 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 power so that the fans
continue to operate in a failed power supply with the redundant fan power
from the peripheral power supply.
Table 7-3 Minimum and Redundant Working Power Supplies
Required to Power Active Boards
Enterprise 5000/4000 Systems Enterprise 6000 System
Number of
Boards
Minimum Working
Power Supplies
Redundant Working
Power Supplies
(Hot-pluggable)
Minimum Working
Power Supplies
Redundant Working
Power Supplies
(Hot-pluggable)
1-21212
3-42323
5-63434
7-8 3 + peripheral supply
1
1. System needsa fourthPCM forcoolingpurposes.
4 + peripheral supply 4 5
9-10 5 6
11-12 6 7
13-14 7 8
15-16 7
2
2. System needsan eighthPCM forcoolingpurposes.
8