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https://issues.apache.org/jira/browse/HDDS-13657?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sumit Agrawal resolved HDDS-13657.
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Fix Version/s: 2.1.0
Resolution: Fixed
> min free space default configuration
> ------------------------------------
>
> Key: HDDS-13657
> URL: https://issues.apache.org/jira/browse/HDDS-13657
> Project: Apache Ozone
> Issue Type: Sub-task
> Components: Ozone Datanode
> Reporter: Sumit Agrawal
> Assignee: Sumit Agrawal
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.1.0
>
>
> Generally for cluster to be healthy, its recommended to have no more than
> 80-90% of disk utilization.
>
> Currently our default
>
> {code:java}
> hdds.datanode.volume.min.free.space.percent is 0.1%
> hdds.datanode.volume.min.free.space = 20GB
> {code}
>
>
> 20GB/0.1% is being set considering previous default value of 5GB, considering
> ozone use case. But overall,
>
> Mostly as observed for disk size in TB range, and more particulary 16TB.
>
> ||%cent config||Disk size||min-free-space||
> |0.1%|16TB| 20GB (Max(16GB,20GB)|
> |1%|16TB|160GB|
> |2%|16TB|320GB|
> |3%|16TB|480GB|
> |5%|16TB|800GB|
> |10%|16TB|1.6TB|
> Considering 10-20% should be kept free, 5% being better default configuration
> based on disk size.
>
> As discussed with community, 2% seems reasonable, not too high reserved over
> higher disk. Additionally Recon will be showing free space reserved for
> clarity.
>
>
>
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