Bug 2223388

Summary:	[RFE][Bluestore] add perf counters for bluefs allocation size strategy change
Product:	[Red Hat Storage] Red Hat Ceph Storage	Reporter:	Tomas Petr <tpetr>
Component:	RADOS	Assignee:	Radoslaw Zarzynski <rzarzyns>
Status:	NEW ---	QA Contact:	Pawan <pdhiran>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	6.1	CC:	akupczyk, bhubbard, ceph-eng-bugs, cephqe-warriors, nojha, sostapov, vumrao
Target Milestone:	---	Keywords:	FutureFeature
Target Release:	6.1z2	Flags:	akupczyk: needinfo? (tpetr)
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Enhancement
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Last Closed:		Type:	Bug
Regression:	---	Mount Type:	---
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Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Tomas Petr 2023-07-17 14:49:18 UTC

Description of problem:
BlueFS can automatically change allocation size from 64K to 4K 
due to possible performance impact or in general for being able to check without increased debug logging enabled, we would like to have easy option to see what BlueFS allocation strategy is being used by the OSD at this moment, or if it has been used in the past

The way to achieve it could be to add OSD perf counters with values like:
 - counter how many times allocation strategy changed
 - current allocation strategy (or something like 4K_alloc_size_strategy = true/false or 1/0 for current strategy)
 - last timestamp of the strategy change 
 

Version-Release number of selected component (if applicable):
RHCS 6.1+

How reproducible:


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Comment 1 Scott Ostapovicz 2023-07-17 14:51:51 UTC

incorrectly targeted at 6.1 z1, retargeting to 6.1 z2.