On Wed, Nov 17, 2010 at 9:14 AM, Venkatesh Srinivas <me@acm.jhu.edu> wrote:
On Wed, Nov 17, 2010 at 11:51 AM, David Leimbach <leimy2k@gmail.com> wrote:
> I'm giving consideration to maintaining a venti-based setup for my house for
> all the digital media we have (since getting our Apple TV, we've had more
> stuff to stream around the house).
> I've just now started playing with things like vac/unvac, to backup and
> extract trees of my HFS+ file system and I wonder about a few things.
> What do people do if they ever lose their venti scores?  Seems like this is
> "handle-less" data now, and fairly useless.
> I figure I could keep a vac archive of venti scores, then I'd only need to
> "remember" one, and name the files I store the scores in reasonably, but if
> that's lost... what are my options?
> Dave

There is a script floating around (dumpvacroots or somesuch) that lets
you recover vac scores given access to the venti arenas.

I'd be very careful with vac -m and -a on Unix; both have been at the
root of considerable data-loss on a unix venti for me. I'd recommend
vac-ing tarballs, rather than using vac's on unix trees directly. But
your mileage may vary...

This is mainly a form of secondary backup for me for now, but given what I learn about it over time, it could become a primary.

Are there any open problem reports around this?  I might be interested in tackling some of these, or at least trying to reproduce them.

I still do some rsync based backups anyway.   
 

-- vs