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https://issues.apache.org/jira/browse/HDDS-9979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17804297#comment-17804297
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Sumit Agrawal commented on HDDS-9979:
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[~ksugihara]
Reserved space is disk space identified to be reserved for open container. Like
open container size is 5GB, so whenever a container is created, it mark 5GB as
reserved (which is not yet written to disk).
So this might show as exceed the physical space.
When actual disk usages reach nearby limit, the container gets closed as
triggered by DN.
> Sum of used, available, and reserved exceeds the physical volume size
> ---------------------------------------------------------------------
>
> Key: HDDS-9979
> URL: https://issues.apache.org/jira/browse/HDDS-9979
> Project: Apache Ozone
> Issue Type: Bug
> Components: DN
> Affects Versions: 1.4.0
> Reporter: Kohei Sugihara
> Priority: Major
> Attachments: cluster1.png, cluster2.png
>
>
> While reviewing DN metrics, I noticed the sum of Used, Available, and
> Reserved is different from the actual volume size. I don't survey Jira deeply
> for existing similar issues, so I'm appreciate tell me similar issues if you
> know. We experienced this issue in two clusters. Cluster #1 gains much data
> and experienced disk full many times.
> h2. Example 1: Cluster #1
> This cluster is consisted from 36 nodes. Each node has 24 of 14 TB HDD
> drives. Expected total capacity per a single node is calculated by: 36 bays *
> 14 TB * 10^12 / 1024^4 = 458 TiB, so the sum of
> {{{}volume_info_metrics_{used,available,reserved{}}}} should be equal to 458
> TiB. However, we experience differ results.
> The cluster1.png shows a stacked bar graph. Reported metrics are vary and
> exceeds 458 TiB.
> !cluster1.png!
> h2. Example 2: Cluster #2
> This is another example and each node has 12 of 14 TB HDD drives. Expected
> total capacity per a single node is calculated by: 12 bays * 14 TB * 10^12 /
> 1024^4 = 153 TiB.
> The cluster2.png shows a stacked bar graph. Reported metrics is almost same
> among DNs but some exceptions exceed the physical capacity.
> !cluster2.png!
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