> I was looking at this a couple of months ago, there were a couple of
> programs abd lsyncd was the one I liked.
> 
> http://code.google.com/p/lsyncd/

Yup, that one fits the description.  It looks really cool!  :-)

I'm not trying to solve any particular problem specifically.  This is really 
for the sake of discussion and understanding of what new technologies are out 
there, for possible future use.

Lsyncd / rsyncd looks like it's a cool inotify-based live sync specifically for 
Linux, when you have a new enough kernel to support inotify.  I'd love to know 
if there are any other permutations already existing, like -- 

Similar live sync for Windows, Mac, or Solaris.

Not-quite live sync (periodic or whatever) that still uses inotify etc, to 
avoid crawling the tree.

The lysncd page has a few links on it that might lead somewhere else.  But 
Again, if anyone knows any more of these type of applications, share the 
knowledge.  Inotify etc is a really cool new(ish) technology that's not being 
used nearly as much as it could be.  It has the potential to really speed up 
backups in some situations.  Wouldn't it be nice if your 
incrementals/differentials could instantly know what changed, and just go 
straight there?

I agree, snapshots are the better solution.  But I don't think Linux lvm 
snapshots deserve mention (except to beg for a refund), and I don't think 
Windows is going there anytime soon.  So for now, there's just ZFS on Solaris 
and WAFL on Netapp.  Eventually something on Linux, (and a half-baked but 
improving solution on Mac).  But nothing in sight for Windows unless you have 
an always-on connection to your network fileshare, or install Server on your 
laptop (for VSS).



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