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Re: [Qemu-devel] RFC: moving fsfreeze support from the userland guest ag


From: Ronen Hod
Subject: Re: [Qemu-devel] RFC: moving fsfreeze support from the userland guest agent to the guest kernel
Date: Sun, 07 Aug 2011 21:28:17 +0300
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.18) Gecko/20110621 Fedora/3.1.11-1.fc14 Thunderbird/3.1.11

Well, we want to support Microsoft's VSS, and that requires a guest agent that communicates with all the "writers" (applications), waiting for them to flush their app data in order to generate a consistent app-level snapshot. The VSS platform does most of the work. Still, at the bottom line, the agent's role is only to find the right moment in time. This moment can be relayed back to libvirt, and from there do it according to your suggestion, so that the guest agent does not do the freeze, and it is actually not a mandatory component.

Ronen.



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