Bug 1760257

Summary:	mon: add mon_memory_target
Product:	[Red Hat Storage] Red Hat Ceph Storage	Reporter:	Neha Ojha <nojha>
Component:	RADOS	Assignee:	Sridhar Seshasayee <sseshasa>
Status:	CLOSED ERRATA	QA Contact:	Manohar Murthy <mmurthy>
Severity:	high	Docs Contact:	Erin Donnelly <edonnell>
Priority:	high
Version:	3.2	CC:	ceph-eng-bugs, ceph-qe-bugs, dzafman, edonnell, kchai, mmurthy, nojha, pasik, sseshasa, tchandra, tserlin
Target Milestone:	rc	Flags:	sseshasa: needinfo-
Target Release:	4.0
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	ceph-14.2.4-95.el8cp, ceph-14.2.4-35.el7cp	Doc Type:	Enhancement
Doc Text:	.New configurable option: `mon_memory_target` {product} {release} introduces a new configurable option, `mon_memory_target`, used to set the target amount of bytes for Monitor memory usage. It specifies the amount of memory to allocate and manage using the priority cache tuner for the associated Monitor daemon caches. The default value of `mon_memory_target` is set to 2 GiB and you can change it during runtime with: [subs="quotes"] ---- # ceph config set global mon_memory_target _size_ ---- Prior to this release, as a cluster scaled, the Monitor specific RSS usage exceeded the limits that were set using the `mon_osd_cache_size` option, which led to issues. This enhancement allows for improved management of memory allocated to the monitor caches and keeps the usage within specified limits.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-01-31 12:47:33 UTC	Type:	Bug
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:
Bug Blocks:	1730176

Description Neha Ojha 2019-10-10 09:21:46 UTC

Add a configurable to set a target for MON memory usage using the priority cache tuner for mon caches. Also implement a config observer to handle changes to mon cache sizes.

Comment 9 Sridhar Seshasayee 2019-12-11 03:57:10 UTC

Hi Bara,

I have added the details in the doc text field.

Thanks,
-Sridhar

Comment 17 Erin Donnelly 2020-01-07 19:56:52 UTC

Thanks Sridhar, could you take a quick look at the edited text and let me know if it looks good?

Comment 18 Sridhar Seshasayee 2020-01-08 09:48:09 UTC

Hi Erin,
The changes look good to me.

Thanks,
-Sridhar

Comment 29 errata-xmlrpc 2020-01-31 12:47:33 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, 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-2020:0312