Bug #65748: Change default upmap_max_deviation to 1 - mgr - Ceph

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Bug #65748

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Change default upmap_max_deviation to 1

Added by Joshua Blanch 17 days ago. Updated 17 days ago.

Status:

Fix Under Review

Priority:

Normal

Assignee:

Laura Flores

Category:

balancer module

Target version:

% Done:

Source:

Community (dev)

Tags:

Backport:

quincy,reef

Regression:

Severity:

3 - minor

Reviewed:

Affected Versions:

ceph-qa-suite:

Pull request ID:

57216

Crash signature (v1):

Crash signature (v2):

Description

Field experience shows that default upmax_max_deviation 5 is not effective to reach well a balanced cluster. This is especially on evident on clusters with many pools, because the deviation of 5 is per pool, so the deviations can pile up, and OSDs can vary by a lot.

There was a previous PR that increased this number to 5 and there was no explanation. #43312