Fan And Communications Module; Storage Server Indicator Lights - IBM TotalStorage DS4500 User Manual

5. Using Figure 41 as a guide, check the storage server indicator lights on the fan.
Figure 41. Storage server indicator lights
6. Replace the DS4500 Storage Server bezel, as shown in Figure 22 on page 22.

Fan and communications module

The fan and communications module is a single, removable unit that contains two
cooling fans and two Ethernet ports. This module plugs into a slot at the center
back of the DS4500 Storage Server, just above the power supplies (see Figure 43
on page 55). It has two captive screws and a rectangular handle for securing and
removing the fan and communications module. The module contains dual fans that
provide a redundant cooling system to both power supplies. If one fan within the
module fails, the other continues to operate. A single fan provides sufficient air
circulation to prevent the power supplies from overheating until you can replace the
entire fan and communications module.
v When the storage server fan is operating properly, the green power indicator
is lit and the amber fan indicator is off.
v If the amber fan indicator is lit or the green power indicator remains off, make
sure that the storage server fan is seated securely in the slot and that the
lever is snapped into place. Check the storage server fan or the fan and
communications module status.
v If the storage server fan indicator remains on, it might indicate a problem with
the new storage server fan or the fan and communications module (both
components share the same indicator light). Replace the storage server fan
with a spare, if available. Otherwise, turn off the DS4500 Storage Server to
prevent it from overheating until you can replace the fan.
Chapter 3. Replacing the DS4500 Storage Server components
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