Jeffrey J. Kosowsky wrote:
>
> > And for extra points, figure out which variations could be adapted to
> > incremental updates as you might want to do to keep an offsite copy in
> > sync. The blockdevice approach would probably require ZFS with its
> > snapshot send/receive functions. The tarPCcopy approach would need to
> > catch all files under directories newer than the previous run - and
> > maybe track current directory contents for deletions which is one of the
> > Gnutar extensions.
>
> You need to be careful about hash chain renumbering which could mess
> things up if you are just looking at file names and file modification
> dates. Would gnutar handle this properly without having to run through
> all the hard links? Some of the simpler methods would fail here
> without additional logic.
No, gnutar doesn't have any way to track and propagate renames. It would
have to delete and copy the pool file contents to the new name - as
would rsync. This would leave the pc files connected to the right
content but no longer associated with the pool. You could simplify this
issue by cheating: make the nightly run log the deletes and renames and
duplicate the actions on the copy, keeping that in sync with creating
the representation of new link items. I think star has some sort of
rename-tracking or inode-following concept in its dump emulation mode
incrementals but I haven't looked at it all that closely. It seemed as
slow as other approaches when I tried it for a full copy, but maybe the
incremental dump mode would get the subsequent things right. Unlike
other tar-alikes, this has to be aligned on filesystem boundaries, but
that probably wouldn't be a big problem.
--
Les Mikesell
lesmikes...@gmail.com
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