IBM 4957-J11, Hardware Installation And Maintenance Manual

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Table 19. Alarm conditions (continued)
Status
Severity Alarm
PSU fan fail Fault - loss of redundancy S1
1
CFF module detected PSU fault Fault S1
1
PSU removed Configuration error None
2
Enclosure configuration error
(VPD)
Fault - critical S1
1
Low warning temperature alert Warning S1
1
High warning temperature alert Warning S1
1
Over temperature alarm Fault - critical S4
3
I
2
C bus failure Fault - loss of redundancy S1
1
Front panel communication error
(I
2
C)
Critical fault S1
1
IOM module fault Fault - critical S1
1, 4
IOM module removed Warning None
2
Drive power control fault Fault - critical - loss of disk power S1
1
Insufficient power available Warning None
2
1
The enclosure will continue operating, requiring an administrator to take appropriate action; such as
replacing a PSU or reducing the room temperature. Alarm messages will be in the COS System
manager interface.
2
An alarm is not issued for this status and severity condition.
3
The enclosure will take action; such as shutting down in order to protect the enclosure’s data
content. Alarm messages are signaled by the SES pages (see “Enclosure management” on page 23).
4
An IOM fault will prevent data from being stored within the Disk Enclosure.
PSU and system fan faults
Overview
Table 20. PSU and system fan faults
Symptom
Cause Recommended action
Front panel Module Fault LED is
amber
1
Any power fault Verify AC mains connections to
the PSU are live
Amber LED is illuminated on fan
module
2
Fan failure Replace system fan module
1
See Figure 14 on page 15 for visual reference of front panel LEDs.
2
See Figure 15 on page 17 for visual reference of PSU LEDs. See Figure 16 on page 18 visual reference
of system fan module LEDs.
Thermal monitoring and control
The storage enclosure system uses extensive thermal monitoring and takes a number of actions to ensure
component temperatures are kept low, and to also minimize acoustic noise. Air flow is from the front to
back of the enclosure.
50 IBM Cloud Object Storage System: Medium/Large J11/J12 Disk Enclosure Hardware Installation and
Maintenance Manual