You have to de-mux and put to a single stream in order to use gun-tar. So
when making DR tapes you de-mux a specific client or clients then send the
tape off site. You now have a DR tape that can be used with GNU-tar for
recovery without needing the backup software. This is a way to move data to
a new machine(s) without having backup software installed on them.


Gary Andresen
Staff Systems Engineer
VERITAS Software Corp.
15725 SW Greystone CT. Suite 200
Beaverton, Oregon 97006
mailto:gary.andresen AT veritas DOT com
Phone:(503)277.6813 
Cell: (503)701.5185



> -----Original Message-----
> From: Fabbro, Andrew P [mailto:Fabbro.Andrew AT cnf DOT com]
> Sent: Friday, January 24, 2003 1:17 PM
> To: 'Deb'; veritas-bu AT mailman.eng.auburn DOT edu
> Subject: RE: [Veritas-bu] Considering moving to NetBackup
> 
> I'm not sure about some of the things you mention:
> 
> >1. With over 200 clients, updating them from one release to the next
> requires
> >   going to each client (via login of some kind) and doing an interactive
> >   pkgadd.  I'm told that NBU allows client updates to be "pushed out."
> This
> >   would save a lot of time, and be version reliable.
> 
> True for the Unix side.  I don't know that you can do that on the Windows
> side (in our environment, the Windows admins always install their own
> clients).
> 
> > 8. LGTO writes in proprietary format to tapes, NBU is modified gnu-tar.
> 
> I don't see this is a benefit.  If you have a set of tapes, you need NBU
> to
> restore from them.  I suppose if there was a nuclear war and you were the
> last man standing and all you had was gnu tar, NBU, and a tape drive, then
> perhaps you'd be further along, but otherwise...how likely are you to try
> any kind of restore without the backup software?  Also, I'm not sure those
> tar files are really readable in the sense that you can use GNU tar to
> recover a file.  You're typically multiplexing blocks from different
> clients...my understanding was always more that the tar files on tape are
> "containers" (via max fragment size) for data, not "tar archives" in the
> recovery sense.
> 
> --
>  Drew Fabbro [fabbro.andrew AT cnf DOT com]
>  Unix Systems Group
>  Desk: 503-450-3374
>  Cell: 503-701-0369
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