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Bug 1464976

Summary:	[RFE] Revise CephFS cache configuration to operate in MB instead of inode count
Product:	[Red Hat Storage] Red Hat Ceph Storage	Reporter:	John Spray <john.spray>
Component:	CephFS	Assignee:	Patrick Donnelly <pdonnell>
Status:	CLOSED ERRATA	QA Contact:	shylesh <shmohan>
Severity:	medium	Docs Contact:	Bara Ancincova <bancinco>
Priority:	medium
Version:	3.0	CC:	anharris, bniver, ceph-eng-bugs, hnallurv, icolle, john.spray, kdreyer, pdonnell, rperiyas
Target Milestone:	rc	Keywords:	FutureFeature
Target Release:	3.0
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	RHEL: ceph-12.2.1-1.el7cp Ubuntu: ceph_12.2.1-2redhat1xenial	Doc Type:	Enhancement
Doc Text:	.MDS cache limits can be configured in bytes New configuration options are now supported that enable configuring Metadata Server (MDS) cache limits to be configured in bytes, not only in inodes count. For details, see the https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/3/html-single/ceph_file_system_guide/#understanding-mds-cache-size-limits[Understanding MDS Cache Size Limits] section in the Ceph File System Guide for Red Hat Ceph Storage 3. Note that limiting the MDS cache by the inodes count is now deprecated.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-12-05 23:34:34 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:	1494421

Description John Spray 2017-06-26 10:37:08 UTC

Use mempools for allocation so that we can track usage in MB and apply cache limits based on that.

Comment 4 Patrick Donnelly 2017-07-12 04:21:26 UTC

Upstream tracker: http://tracker.ceph.com/issues/20594

Comment 5 Brett Niver 2017-08-18 16:41:25 UTC

This isn't going to make it into Luminous - so we need a new target.  Currently 3.0 is the latest I see.

Comment 6 Brett Niver 2017-08-18 20:41:54 UTC

Looks like we'll actually have this in roughly a week.  Not necessarily bug free by feature freeze, but we should have code.  I'm setting this back to target 3.0, dev-ack+ ceph-3.0/? flags.

I'd really like to get this in - since it's one of the features we identified in our planning last fall as just needing to be done.

If I'm setting something wrong, please just send me a note and make me fix it so I can develop my muscle memory.

Comment 13 Ramakrishnan Periyasamy 2017-10-30 12:33:36 UTC

Moving this bug to Verified state.

Tested this part of cephfs test case execution by limiting the cache.

Comment 16 errata-xmlrpc 2017-12-05 23:34:34 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-2017:3387