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Drive Fan Pack
Figure 1-13
The drive fan pack (see Figure 1-3 and Figure 1-13) cools the disk
modules, power supplies, and link control cards in the IP4700. A
separate pack (described in the next section) cools the storage
processors. 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.
The drive fan pack has one status light. The status light is described
in Chapter 3. Latches on the drive fan pack hold the pack in place.
Drive Fan Pack
IMPORTANT: You can remove the drive fan pack while the IP4700 is
powered up. While the pack is removed, the Cooling Check LED on each
power supply flashes. If the pack is removed for more than approximately
two minutes, the disk modules and storage processors power down. While
the fan is removed, the cache is off and flushing; the storage processors
continue operation unless the unit powers down.
The disk modules and storage processors power up when you reinstall the
drive fan pack.
Fan fault
LED
(yellow)
EMC1451
The IP4700
Drive Fan Pack
1-17
1
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