Fan And Communications Module; Servicing Notes; Storage Server Indicator Lights - IBM TotalStorage DS4400 User Manual

Figure 41. Storage server indicator lights
6. Replace the DS4400 Storage Server bezel, as shown in Figure 22 on page 23.

Fan and communications module

The fan and communications module is a single, removable unit containing two
cooling fans and two Ethernet ports. This module plugs into a slot at the center
back of the DS4400 Storage Server, just above the power supplies (see Figure 43
on page 54). It has a locking lever and a pull 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.

Servicing notes

Consider the following when servicing the fan and communications module:
52
IBM TotalStorage DS4400 Fibre Channel Storage Server: User's Guide
Power
Green light indicates power is on.
Normal status: On
Problem status: Off
Power supply
Amber light indicates a power supply fault.
Normal status: Off
Problem status: On
Fan
Amber light indicates a fan fault.
Normal status: Off
Problem status: On
Controller
Amber light indicates a controller fault.
Normal status: Off
Problem status: On
Fast Write Cache
Green light indicates data in cache.
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 DS4400 Storage Server to
prevent it from overheating until you can replace the fan.
Fan