On Fri, Jan 20, 2006 at 02:10:12PM -0600, Les Mikesell wrote:
> The number of hardlinks makes rsync (or other file-oriented) copies
> impractical if the archive is large at all, 

It occurs to me that you could, rather than rsyncing at the filesystem,
rsync the raw device that holds the filesystem.  That would not
require an inordinate amount of RAM.

You'd of course need to use a snapshotting technique, or unmount the
filesystems, first.  It also would be prudent to fill the empty space
in the filesystem with nulls the first time you transferred it (and use
some method other than rsync to do the transfer - or send a dump image,
or something).  Or, I suppose the first time you could just mail a
hard drive.

I've done this with oracle database dump files, and it worked fine.
These are binary data structures just like filesystems are. 

> plus you'd end up
> not being able to access the copy unless you have configured an
> instance of backuppc that understands the layout.  

This strikes me as minimal effort, just rsync the configuration files
too.

> What I ended
> up doing is a scheduled rsync at the remote offices to a linux
> box there, then the central backuppc server archives that copy
> over a WAN or VPN connection. This wastes some disk space since
> the intermediate copy is not compressed and only keeps one copy
> locally, but everything else works out pretty well.

Does it not also waste WAN bandwidth?  Doesn't backuppc's pooling stuff
happen at the backuppc server, so you'd end up copying all the OS files
for each machine over the WAN?

danno
--
dan pritts - systems administrator - internet2
734/352-4953 office        734/834-7224 mobile


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