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.
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External Chassis Fan Probes Information
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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. Full redundancy is defined by system specification.
Redundancy status is Degraded when two
fans are working. Degraded redundancy means that one or more of the
extra fans is not working in the normal range.
Redundancy status is Lost when one fan
is working. 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.
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.