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AWS can schedule maintenance events for your instances, such as a reboot, stop/start, or retirement. See the AWS documentation Scheduled events for your instances for more details. OneFS monitor scheduled maintenance events periodically from every node through IMDS and performs the required actions. OneFS will also generate CELOG events with the event details. To complete some of the actions, OneFS may shut down the affected node and user needs to start the instance back.
Table 14 contains a list of AWS maintenance events, action taken by OneFS to resolve, type of CELOG events generated by OneFS, and the expected user actions.
AWS event type | AWS event description | OneFS action | OneFS CELOG event | User action |
Instance stop | At the scheduled time, the instance is stopped. When you start it again, it is migrated to a new host. Applies only to instances backed by AWS EBS. | Shutdown node | Node is scheduled to shutdown due to host hardware failure. | Manually start the instance |
Instance retirement | At the scheduled time, the instance is stopped if it is backed by AWS EBS, or terminated if it is backed by instance store. | Shutdown node | Node is scheduled to shutdown due to host hardware failure. | Manually start the instance |
Instance reboot | At the scheduled time, the instance is rebooted. | Reboot node | Node is scheduled to reboot following maintenance. | No manual action required |
System reboot | At the scheduled time, the host for the instance is rebooted. | Shutdown node | Host is scheduled to reboot following maintenance. | Manually start the instance |
System maintenance | At the scheduled time, the instance might be temporarily affected by network maintenance or power maintenance. | Shutdown node | Host is scheduled to reboot following maintenance. | Manually start the instance |