Il 14/05/2013 10:50, Kevin Wolf ha scritto: > Or, to translate it into our existing terminology, drive-mirror > implements a passive mirror, you're proposing an active one (which we > do want to have). > > With an active mirror, we'll want to have another choice: The mirror can > be synchronous (guest writes only complete after the mirrored write has > completed) or asynchronous (completion is based only on the original > image). It should be easy enough to support both once an active mirror > exists.
Right, I'm waiting for Stefan's block-backup to give me the "right" hooks for the active mirror. The bulk phase will always be passive, but an active-asynchronous mirror has some interesting properties and it makes sense to implement it. Paolo
