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https://issues.apache.org/jira/browse/HDDS-13208?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wei-Chiu Chuang resolved HDDS-13208.
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Fix Version/s: 2.1.0
Resolution: Fixed
> [Docs] Add volume management section under Architecture/Datanodes
> -----------------------------------------------------------------
>
> Key: HDDS-13208
> URL: https://issues.apache.org/jira/browse/HDDS-13208
> Project: Apache Ozone
> Issue Type: Task
> Components: documentation
> Reporter: Wei-Chiu Chuang
> Assignee: Wei-Chiu Chuang
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.1.0
>
>
> I tried to find any reference to volumes in an Ozone Datanode, but couldn't
> find any.
> https://ozone.apache.org/docs/edge/concept/datanodes.html
> I want to add a section "Volume management" in Datanodes.md
> We should
> (1) explain what a volume is in the context of Ozone DataNode; do not confuse
> it with namespace volumes in Ozone Manager. That a "volume" is essentially a
> disk, and a volume stores many containers.
> (2) I wanted to also add descriptions for volume choosing policy. Find the
> description for the property hdds.datanode.volume.choosing.policy. There are
> two policies: CapacityVolumeChoosingPolicy (default) and
> RoundRobinVolumeChoosingPolicy. Use the source code as the source of truth to
> explain what they do and how they work.
> (3) Create a table to include configuration properties related to volumes.
> Include default values and descriptions.
> (3) Add a disk balancer description -- while volume choosing policy is
> useful, cluster operations can result in imbalanced disks. For example, in
> scenarios that we need to add new disks or to replace broken disks, the
> datanode's disks usage becomes uneven Ozone community is developing a new
> feature 'disk balancer' that aims to balance disks of Datanodes. The feature
> is under development of HDDS-5713, and is coming soon.
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