Bug 963415

Summary:	VSS support for qemu-ga-win
Product:	Red Hat Enterprise Linux 6	Reporter:	Dave Allan <dallan>
Component:	libvirt	Assignee:	Michal Privoznik <mprivozn>
Status:	CLOSED NOTABUG	QA Contact:	Virtualization Bugs <virt-bugs>
Severity:	high	Docs Contact:
Priority:	high
Version:	6.5	CC:	acathrow, areis, bsarathy, dyasny, dyuan, gsun, honzhang, juzhang, michen, mkenneth, mzhan, qzhang, rhod, sluo, tsekiyam, virt-maint, whuang
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:	948017	Environment:
Last Closed:	2013-06-27 15:33:48 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:	948017
Bug Blocks:	883504, 896690

Description Dave Allan 2013-05-15 18:35:15 UTC

+++ This bug was initially created as a clone of Bug #948017 +++

When performing online backups, applications are not aware of guest-agent freeze/thaw commands and therefore the filesystem may be in an inconsistent state due to pending disk flushes.

For Linux, there's support for guest-agent hooks on freeze/thaw (Bug 911569), which can be used to notify applications (or stop/start daemons). On Windows, the correct way to handle freeze/thaw is using the VSS API.

Some details about VSS:
http://msdn.microsoft.com/en-us/library/windows/desktop/bb968832%28v=vs.85%29.aspx

--- Additional comment from Ademar de Souza Reis Jr. on 2013-05-15 10:04:10 EDT ---

Update: Hitachi is proposing it upstream. Please review the patch and help them get it merged:

http://lists.gnu.org/archive/html/qemu-devel/2013-02/msg01963.html

Comment 2 Michal Privoznik 2013-05-16 08:25:30 UTC

I don't think there's a need fro any libvirt integration. However, I'll keep an eye on this, if something pops up.

Comment 3 Michal Privoznik 2013-06-27 15:33:48 UTC

I don't see any room for libvirt involvement here as I've stated in comment 2. Since then the nature of the bug hasn't changed so I am closing this one. If somebody disagrees please do reopen.