Bug 2227309 - RFE: change default value of "mds_bal_interval" to "0", aka false
Summary: RFE: change default value of "mds_bal_interval" to "0", aka false
Keywords:
Status: ASSIGNED
Alias: None
Product: Red Hat Ceph Storage
Classification: Red Hat Storage
Component: CephFS
Version: 5.3
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: ---
: 7.1
Assignee: Patrick Donnelly
QA Contact: Hemanth Kumar
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2023-07-28 16:42 UTC by Manny
Modified: 2023-07-28 20:42 UTC (History)
3 users (show)

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System ID Private Priority Status Summary Last Updated
Github ceph ceph pull 52196 0 None open mds: add balance_automate fs setting 2023-07-28 20:42:39 UTC
Red Hat Bugzilla 2203258 0 unspecified CLOSED MDS Behind on trimming (145961/128) max_segments: 128, num_segments: 145961 2023-07-28 17:03:08 UTC
Red Hat Issue Tracker RHCEPH-7104 0 None None None 2023-07-28 16:43:40 UTC
Red Hat Knowledge Base (Solution) 7026124 0 None None None 2023-07-28 17:02:34 UTC

Description Manny 2023-07-28 16:42:52 UTC 
Description of problem:  RFE: change default value of "mds_bal_interval" to "0", aka false

From case 03492882 and BZ (https://bugzilla.redhat.com/show_bug.cgi?id=2203258) we see that having "mds_bal_interval" enabled results in performance issue. Beyond the log evidence in BZ 2203258, the customer reports that Ceph FS latency has dropped by 75 percent and I/O in the cluster has doubled since "mds_bal_interval" was set to false on their system.

We'd like to see the change in 5.3z-whatever and 6.1z-whatever and beyond

See also KCS #7026124, (https://access.redhat.com/solutions/7026124)

This same customer commented if this feature hampers performance this much and there is no intention on fixing it, the default value should be changed.


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