Bug 1589967

Summary:	[RFE] support to drop cache in MDS via `ceph tell`
Product:	[Red Hat Storage] Red Hat Ceph Storage	Reporter:	Patrick Donnelly <pdonnell>
Component:	CephFS	Assignee:	Venky Shankar <vshankar>
Status:	CLOSED ERRATA	QA Contact:	Tejas <tchandra>
Severity:	low	Docs Contact:	Bara Ancincova <bancinco>
Priority:	high
Version:	3.2	CC:	ceph-eng-bugs, ceph-qe-bugs, edonnell, hnallurv, kdreyer, pasik, vshankar
Target Milestone:	rc	Keywords:	FutureFeature
Target Release:	3.2
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	RHEL: ceph-12.2.8-14.el7cp Ubuntu: ceph_12.2.8-12redhat1	Doc Type:	Enhancement
Doc Text:	.A new subcommand: `drop_cache` The `ceph tell` command now supports the `drop_cache` subcommand. Use this subcommand to drop Metadata Server (MDS) cache without restarting, trim its journal, and ask clients to drop all capabilities that are not in use.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-01-03 19:01:22 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:	1629656

Description Patrick Donnelly 2018-06-11 18:24:53 UTC

This is a tell command which allows the MDS to drop its cache without restarting, trim its journal (so failover does not cause the cache to become warm from reading the journal), and ask clients to drop all caps not in use.

Comment 14 errata-xmlrpc 2019-01-03 19:01:22 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-2019:0020