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Bug 2383118

Summary:	[8.1z Backport] [IBM_Support] File splitting and file moves on cephfs subvolume are slow
Product:	[Red Hat Storage] Red Hat Ceph Storage	Reporter:	Patrick Donnelly <pdonnell>
Component:	CephFS	Assignee:	Patrick Donnelly <pdonnell>
Status:	CLOSED ERRATA	QA Contact:	Manimaran M <manim>
Severity:	medium	Docs Contact:	Rivka Pollack <rpollack>
Priority:	high
Version:	7.1	CC:	bkunal, ceph-eng-bugs, cephqe-warriors, hyelloji, manim, ngangadh, rpollack, sumr, tserlin, vshankar
Target Milestone:	---
Target Release:	8.1z2
Hardware:	All
OS:	All
Whiteboard:
Fixed In Version:	ceph-19.2.1-237.el9cp	Doc Type:	Bug Fix
Doc Text:	.MDS flushes log promptly after certain rename scenarios Previously, the MDS incorrectly delayed flushing its log to meet durability requirements when certain internal lock flows occurred before it sent a rename operation reply to a client. This caused some operations to be delayed by up to 5 seconds. With this fix, the MDS now flushes its log correctly, ensuring conflicting operations are no longer artificially delayed.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2025-08-18 14:01:04 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2371495
Bug Blocks:	2383122

Description Patrick Donnelly 2025-07-23 15:59:59 UTC

This bug was initially created as a copy of Bug #2371495

I am copying this bug because: 

8.1 backport

Description of problem:
Customer is experiencing a significant degraded performance when executing a file split/move operation (1 million line file is split into 50,000 files) and files are moved to different directories

Version-Release number of selected component (if applicable):
ceph 18.2.1-298 (7.1z3)
odf  4.14.17

How reproducible:
Always at the customer site.  This is occurring in 3 of the 4 clusters.

Steps to Reproduce:
1. Receive 4 1 million line files from mainframe
2. Execute a split/move operation to break up 1 of the million line file into 50,000 files and move files to different directories.


Actual results:
File splits and moves are significantly slower than they were prior to the upgrade.

Expected results:
File splits and moves should produce similar performance as on the older version. 

Additional info:
The cluster which does not experience the issue is running older version of ceph/odf/ocp version (4.12)

Comment 11 errata-xmlrpc 2025-08-18 14:01:04 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Red Hat Ceph Storage 8.1 security and bug fix updates), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2025:14015