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False “SwitchFanNotPresent_Alert” reported and clearing repeatedly

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Applies to

  • Cluster Switch Health Monitor (CSHM)
  • Cluster Network Switches

Issue

  • Despite no issues seen on cluster switches, following AutoSupport alerts are received. Example:

Call home for Health Monitor process cshm: SwitchFanNotPresent_Alert...

  • Alerts are raised and cleared in seconds or minutes. Example:

Sun Jan 1 00:00:36 +0100 [node_name: cshmd: hm.alert.raised:alert]: Alert Id = SwitchFanNotPresent_Alert , Alerting Resource = switch_name-1/Fan Module-1 raised by monitor ethernet-switch

Sun Jan 1 00:03:03 +0100 [node_name: cshmd: hm.alert.cleared:notice]: Alert Id = SwitchFanNotPresent_Alert , Alerting Resource = switch_name-1/Fan Module-1 cleared by monitor ethernet-switch

  • Other sensor may be calling out as well such as power suply. Example: 

Sun Jan 1 00:05:23 +0100 [node_name: cshmd: hm.alert.raised:alert]: Alert Id = SwitchPowerNotPresent_Alert , Alerting Resource = switch_name-1/PowerSupply-1 raised by monitor ethernet-switch
Sun Jan 1 00:05:23 +0100 [node_name: cshmd: hm.alert.raised:alert]: Alert Id = SwitchPowerNotPresent_Alert , Alerting Resource = switch_name-1/PowerSupply-2 raised by monitor ethernet-switch
Sun Jan 1 00:08:16 +0100 [node_name: cshmd: hm.alert.cleared:notice]: Alert Id = SwitchPowerNotPresent_Alert , Alerting Resource = switch_name-1/PowerSupply-1 cleared by monitor ethernet-switch
Sun Jan 1 00:08:16 +0100 [node_name: cshmd: hm.alert.cleared:notice]: Alert Id = SwitchPowerNotPresent_Alert , Alerting Resource = switch_name-1/PowerSupply-2 cleared by monitor ethernet-switch

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