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https://issues.apache.org/jira/browse/HDDS-15028?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HDDS-15028:
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Labels: pull-request-available (was: )
> [Website v2][Troubleshooting] How to exit safe mode
> ---------------------------------------------------
>
> Key: HDDS-15028
> URL: https://issues.apache.org/jira/browse/HDDS-15028
> Project: Apache Ozone
> Issue Type: Sub-task
> Components: documentation
> Reporter: Wei-Chiu Chuang
> Priority: Major
> Labels: pull-request-available
>
> https://ozone.apache.org/docs/core-concepts/architecture/storage-container-manager/#how-to-exit-safe-mode
> Typically SCM should exit safe mode by itself. We need a troubleshooting doc
> to identify the problem that prevent automatic safe mode exit.
> Symptoms:
> Client application attempting to write files, but the request is rejected
> with exception message "SafeModePrecheck failed for allocateBlock"
> Get safe mode status:
> 'ozone admin safemode --verbose' command, or check leader SCM web UI. At the
> bottom is the Safemode rules statuses, and the SCM stays in the safe mode if
> any of the rules is not satisifed.
> 1. In a SCM-HA environment, only one SCM is up. In which case, start the
> other two SCM.
> 2. insufficient number of Datanodes are up. Too many datanodes are not
> available, either they are down, or they have not completed startup process.
> For example, datanodes are still verifying containers and volumes.
> 3. Insufficient number of healthy containers. Containers may not be
> replicated sufficiently, or some containers are corrupt. Run 'ozone admin
> container report' command to check what happens. See Container Replication
> Report page at
> https://ozone.apache.org/docs/administrator-guide/operations/container-replication-report
> for details.
> If admin is absolutely sure the cluster is healthy, manually exit the safe
> mode using command 'ozone admin safemode --force-exit'
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