From mboxrd@z Thu Jan 1 00:00:00 1970 MIME-Version: 1.0 In-Reply-To: References: Date: Wed, 17 Nov 2010 09:24:23 -0800 Message-ID: From: David Leimbach To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net> Content-Type: multipart/alternative; boundary=0016e6464d1ac5cbfa049542f14b Subject: Re: [9fans] Anyone using p9p or Plan 9 venti as a more generic backup system? Topicbox-Message-UUID: 8429c774-ead6-11e9-9d60-3106f5b1d025 --0016e6464d1ac5cbfa049542f14b Content-Type: text/plain; charset=ISO-8859-1 On Wed, Nov 17, 2010 at 9:14 AM, Venkatesh Srinivas wrote: > On Wed, Nov 17, 2010 at 11:51 AM, David Leimbach > 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 > > --0016e6464d1ac5cbfa049542f14b Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

On Wed, Nov 17, 2010 at 9:14 AM, Venkate= sh Srinivas <me@acm.= jhu.edu> wrote:
On Wed, Nov 17, 2010 at 11:51 AM, David L= eimbach <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 h= ad more
> stuff to stream around the house).
> I've just now started playing with things like vac/unvac, to backu= p and
> extract trees of my HFS+ file system and I wonder about a few things.<= br> > What do people do if they ever lose their venti scores? =A0Seems 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 rea= sonably, but if
> that's lost... what are my options?
> Dave

There is a script floating around (dumpvacroots or somesuch) th= at 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 a= ny open problem reports around this? =A0I might be interested in tackling s= ome of these, or at least trying to reproduce them.

I still do some rsync based backups anyway. =A0=A0
=A0

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