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https://issues.apache.org/jira/browse/HDDS-14501?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gargi Jaiswal reassigned HDDS-14501:
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Assignee: Gargi Jaiswal
> [Website v2] [Docs] [Administrator Guide] Replacing Datanode Disks
> ------------------------------------------------------------------
>
> Key: HDDS-14501
> URL: https://issues.apache.org/jira/browse/HDDS-14501
> Project: Apache Ozone
> Issue Type: Sub-task
> Components: documentation
> Reporter: Wei-Chiu Chuang
> Assignee: Gargi Jaiswal
> Priority: Major
>
> [https://ozone-site-v2.staged.apache.org/docs/administrator-guide/operations/disk-replacement/datanodes]
>
> A datanode may have multiple data volumes, specified in hdds.datanode.dir.
> For example,
> {noformat}
> /data1,/data2,/data3{noformat}
> hdds.datanode.failed.data.volumes.tolerated: The number of data volumes that
> are allowed to fail before a datanode stops offering service. By default,
> this value is -1, meaning unlimited.
>
> Similarly, hdds.datanode.failed.metadata.volumes.tolerated allows a number of
> metadata volumes to fail.
>
> During datanode startup, it performs check to determine if a volume fails. If
> the datanode is allowed to continue without abort, the volume is taken off.
> After datanode starts, a periodic disk check is run every 60 minutes
> (determined by configuration property
> hdds.datanode.periodic.disk.check.interval.minutes.
>
> When a volume is determined failed, it is chosen by volume choosing policy to
> allocate new containers.
>
> To replace the failed disks, shut down the datanode, update hdds.datanode.dir
> to remove it from the directory list, and then restart the datanode.
>
> note: Ozone datanode does not support hotswap yet, meaning to update the disk
> list, it must restart the datanode process.
>
> The state of volumes can be seen in Datanode metrics and web UI.
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