replicating a live directory

Jan-Benedict Glaw jbglaw at
Thu Apr 3 00:28:40 GMT 2008

On Wed, 2008-04-02 19:20:09 -0400, Matt McCutchen <matt at> wrote:
> 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.

Live replication--one day I'll play with it again.

Another approach could be a shared device (think nbd) with a
sync-mounted filesystem.


      Jan-Benedict Glaw      jbglaw at              +49-172-7608481
Signature of: They that give up essential liberty to obtain temporary safety,
the second  : deserve neither liberty nor safety.  (Ben Franklin)
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