System Fan Module - IBM 106 Hardware Installation And Maintenance Manual

Module LED
PSU Status LED
(bitonal):
Multiple power supply unit modules
The Model 106 storage system includes two PSUs which provide redundant power control for the system
so that if one module fails, the other maintains the power supply, and enclosure operation is not affected
while you replace the faulty module.
PSUs are hot-pluggable, and replacement should only take a few seconds. Replacement must be
completed as soon as possible after the removal of the defective PSU to avoid a thermal exception. The
replacement procedure should be completed within an absolute maximum of 3 minutes.
Note: If the time taken for PSU removal and replacement exceeds 3 minutes, the system might shut
down.
Important: Operation of the enclosure with any modules missing will disrupt the airflow, and the disks
will not receive sufficient cooling. It is essential that all slots are fitted with PSUs prior to powering on the
enclosure.
Important: To avoid potential equipment damage during transport and subsequent loss of data, see
`Procedure: Transporting a 5U expansion enclosure. The procedure describes what to do for the
following situations:
• When you are powering off an expansion enclosure because you intend to transport it to another
location.
• When you intend to move a rack that contains an expansion enclosure.
The procedure describes how to remove each drive from the enclosure and transport the enclosure.
Removing the drives prevents damage to the drives and makes the lighter enclosure easier to move.

System fan module

CAUTION: Hazardous moving parts nearby. (L008)
CAUTION: High levels of acoustical noise are (or could be under certain circumstances) present.
Use approved hearing protection and/ or provide mitigation or limit exposure. (L018)
LED behavior states
PSU OK (Green) PSU fault/failure
(Amber/blinking amber)
Chapter 3. System Overview 17
Power off (Off)