Chapter 1 About the PFC500/E
24
PFC 500/E Instruction Manual
2 December 1999
Drive fan pack
The drive fan pack cools the disk modules and RCs in the PFC500. The drive fan pack
contains three fans that draw ambient room air through the front door, across the drive
modules, and through the midplane and power supplies. The drive fan pack connects
directly to both power supplies, and either supply can power it. The fans operate at a
lower voltage and speed during normal operation to minimize acoustic noise. If a fan
fails, the voltage and speed of the remaining fans increase to compensate, resulting in
higher acoustic noise.
One status light on the drive fan pack indicates status. The status light is described in
the “Monitoring PFC 500 status” section of Chapter 3.
Latches on the drive fan pack hold the pack in place.
IMPORTANT: You can remove the drive fan pack while the PFC500 is powered up.
While the pack is removed, the Cooling Check light on each power supply flashes.
If the pack is removed for more than approximately two minutes, the disk modules
power down and the RCs go into standby mode. When you re-install the drive fan
pack, the disk modules power up and the RCs go into active mode.
Configurations
The PFC 500 minimum and maximum configurations are as follows.
The maximum configuration provides the most redundancy, and therefore the highest
degree of system availability. The fan pack provides redundant cooling for any
configuration.
What next?
Continue to the next chapter, which tells how to install a PFC500/E.
Configuration
RCs
Power Supplies
Disk Modules
minimum
1
2
1
1
5
5
maximum
2
2
10
Check light
(amber)
Latches
Latches
!