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Bug 1813965

Summary:	[RFE] snapshot-based mirroring
Product:	[Red Hat Storage] Red Hat Ceph Storage	Reporter:	Jason Dillaman <jdillama>
Component:	RBD-Mirror	Assignee:	Ilya Dryomov <idryomov>
Status:	CLOSED ERRATA	QA Contact:	Gopi <gpatta>
Severity:	medium	Docs Contact:	Ranjini M N <rmandyam>
Priority:	unspecified
Version:	5.0	CC:	ceph-eng-bugs, ceph-qe-bugs, gpatta, idryomov, kdreyer, rmandyam, vereddy
Target Milestone:	---	Keywords:	FutureFeature
Target Release:	5.0
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	ceph-16.0.0-8633.el8cp	Doc Type:	Enhancement
Doc Text:	.Snapshot-based mirroring of RBD images The journal-based mirroring provides fine-grained crash-consistent replication at the cost of double-write penalty where every update to the image is first recorded to the associated journal before modifying the actual image. With this release, in addition to journal-based mirroring, snapshot-based mirroring is supported. It provides coarse-grained crash-consistent replication where the image is mirrored using the mirror snapshots which can be created manually or periodically with a defined schedule. This is supported by all clients and requires a less stringent recovery point objective (RPO).	Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-08-30 08:23:52 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:	1929661, 1959686

Description Jason Dillaman 2020-03-16 15:17:07 UTC

In addition to the existing support for journal-based mirroring, RBD will now support snapshot-based mirroring. This feature is enabled on a per-image basis which means that rbd-mirror must be configured in image mode:

  $ rbd mirror pool enable <pool-name> image

To enable the feature on a specific image:

  $ rbd mirror image enable <image-spec> snapshot

To create a mirror snapshot:

  $ rbd mirror image snapshot <image-spec>

Additionally, mirror snapshots can be scheduled to be periodically created via the CLI:

  $ rbd mirror snapshot schedule add ...
  $ rbd mirror snapshot schedule rm ...
  $ rbd mirror snapshot schedule ls ...
  $ rbd mirror snapshot schedule status ...

Comment 1 RHEL Program Management 2020-03-16 15:17:14 UTC

Please specify the severity of this bug. Severity is defined here:
https://bugzilla.redhat.com/page.cgi?id=fields.html#bug_severity.

Comment 4 Gopi 2021-03-05 05:04:16 UTC

Feature is working as expected, hence moving this bug to verified state.

Comment 13 errata-xmlrpc 2021-08-30 08:23:52 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 5.0 bug fix and enhancement), 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-2021:3294