Several different types of problems may result in unexpected node reboots.
|Possible cause||How to confirm|
|Physical host hardware failures||If on-premises, check the hardware System Event Log (SEL).|
|VM or hypervisor failures||Check the hypervisor or the cloud VM logs.|
|OS kernel crash||Check
|Out of memory||Check
|Node evicted and rebooted by Oracle Clusterware because of network disruption on the node or between the nodes||Check the CRS alert log files for the reason of eviction. Check
|Node evicted and rebooted by Oracle Clusterware because of excessive CPU load on the surviving node||Check