replicating a live directory

[Matt McCutchen]

On Wed, 2008-04-02 at 19:15 -0400, Clark wrote:
> Matt McCutchen wrote:
> > It's not clear to me how a filesystem snapshot would solve the problem.
> > It guarantees that rsync sees an instantaneous state of the filesystem,
> > but that state could still include files that are half-modified by other
> > programs.
> > 
> I shut everything down so that it is not "live", do a snapshot, then let
> people go again.  It is not perfect, but the snapshot process takes only
> a second or two, then people can work for the hours it takes for rsync
> to run.

Good point.  A filesystem snapshot doesn't avoid the need to stop the
services, but it greatly reduces the length of the downtime.

Matt
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