ONTAP reports that a cluster switch has rebooted, when the switch did not reboot

Applies to

• ONTAP 9.0 through ONTAP 9.5
• Cisco Nexus Cluster Switches

Issue

ONTAP generates an alert indicating that a cluster switch has rebooted:

Cluster::*> system health alert show -alert-id SwitchReboot_Alert
               Node: Cluster-01
           Resource: clussw1(FOX0000ZZZZ)
           Severity: Minor
    Indication Time: Wed Jan 2 00:00:00 2019
           Suppress: false
        Acknowledge: false
     Probable Cause: The cluster switch "clussw1(FOX0000ZZZZ)" has
                     recently rebooted.
    Possible Effect: Communication problems and cluster connectivity issues
                     might occur.
 Corrective Actions: 1) If the cluster switch was not rebooted on purpose, then
                     check the switch to ensure that it is operating normally.
                     2) If errors persist, contact technical support for
                     further assistance.
     
Wed Jan 2 00:00:00 UTC [Cluster-01: cshmd: hm.alert.raised:alert]: Alert Id = SwitchReboot_Alert , Alerting Resource = clussw1(FOX0000ZZZZ) raised by monitor cluster-switch
Wed Jan 2 00:05:00 UTC [Cluster-01: cshmd: hm.alert.cleared:notice]: Alert Id = SwitchReboot_Alert , Alerting Resource = clussw1(FOX0000ZZZZ) cleared by monitor cluster-switch
 

The cluster switch shows no evidence of a reboot and the uptime confirms that no switch reboot occurred:

clussw1# show system uptime
System start time:          Thu Dec 1 00:00:00 2017
System uptime:              397 days, 11 hours, 6 minutes, 51 seconds
Kernel uptime:              397 days, 11 hours, 8 minutes, 41 seconds
Active supervisor uptime:   397 days, 11 hours, 6 minutes, 51 seconds

clussw1# show version | include uptime
Kernel uptime is 397 day(s), 11 hour(s), 8 minute(s), 43 second(s)