External Chassis Fan Probes Information

Use this window to review the redundancy status of external chassis fans and to see a list of fans.

Systems can be designed with redundant fans to prevent system shutdown due to fan failure. When fans are present in a system, being able to see that one or two fans have failed enables administrators to replace fans and restore redundancy before the last fan failure causes the entire system to fail. 

External Chassis Fan User Privileges

System Tree Selection  Tab Subtab User Privileges
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External Chassis NA
Fans Properties Probes  U, P, A NA

 Fan Redundancy

Redundancy Status Status can be Full, Degraded, or Lost. If the number of fans in a system that is required for full redundancy is three:

Redundancy status is Full when three fans are working.

Redundancy status is Degraded when two fans are working.

Redundancy status is Lost when one fan is working.

Full redundancy is defined by system specification. Degraded redundancy means that one or more of the extra fans is not working in the normal range. Lost redundancy means that there are no backup fans available to take over for the minimum number required, but at least one fan is working. 

Critical/Failure status would describe a system that had no working fan, and redundancy is designed to make this sort of system failure unlikely.

Number of devices  required for full redundancy Your system has a number of fans defined for full redundancy. If the number of fans required for Full redundancy is three, redundancy is degraded when two fans are working, and lost when only one fan is working.

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Fan Probe List

Status Displays whether the event type for the probe is Normal/OK, Warning/Noncritical, or Critical/Failure.
Probe Name Displays the alphanumeric text that uniquely identifies a fan probe; for example, CPU Fan
Reading Displays a snapshot of the fan RPM actually measured by the probe at a given time.
Minimum Warning Threshold Displays the lowest acceptable fan RPM that is recommended for system operation. Values that fall below this RPM level result in warning events.
Maximum Warning Threshold Displays the highest acceptable fan RPM that is recommended for system operation. Values that exceed this fan RPM result in warning events.
Minimum Failure Threshold Displays the lowest acceptable fan RPM that is required for system operation. Values that fall below this fan RPM result in critical/failure events.
Maximum Failure Threshold Displays the highest acceptable fan RPM that is required for system operation. Values that exceed this fan RPM result in critical/failure events.

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