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Posted to issues@ozone.apache.org by "Sammi Chen (Jira)" <ji...@apache.org> on 2025/09/24 11:23:00 UTC
[jira] [Commented] (HDDS-13696) [DiskBalancer] New volume choosing policy implementation to support heterogeneous disks in DN
[ https://issues.apache.org/jira/browse/HDDS-13696?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18022401#comment-18022401 ]
Sammi Chen commented on HDDS-13696:
-----------------------------------
{color:#1d1c1d}If DN disks are heterogeneous, for example, mixed high density disks(20TB) with normal density disks(2TB), current new container volume choosing policy, {color}
{color:#1d1c1d}a. RoundRobinPipelineChoosePolicy, will cause high density disk low utilization, and normal density disks high utilization{color}
{color:#1d1c1d}b. CapacityPipelineChoosePolicy, will cause {color:#1d1c1d}high density disk{color} high utilization, and normal density disks low utilization{color}
So for {color:#1d1c1d}heterogeneous{color} disks, first we need a volume choosing policy implementation for new container creation, which can place the container welly so that each disk will have close utilization.
Close this Jira after discussed with [~sumitagrawl].
> [DiskBalancer] New volume choosing policy implementation to support heterogeneous disks in DN
> ---------------------------------------------------------------------------------------------
>
> Key: HDDS-13696
> URL: https://issues.apache.org/jira/browse/HDDS-13696
> Project: Apache Ozone
> Issue Type: Sub-task
> Reporter: Sumit Agrawal
> Assignee: Gargi Jaiswal
> Priority: Major
>
> Volume choosing -- disk free space
> Disk balancer -- density
>
> ==> frequent container movement
>
> So if a new container is created, should not cause disk balancer to run. May be optimimal threshold can avoid this, but a risk over highly skewed disk.
>
>
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