recovering data from a truncated vn-file possible?

[Paul Schenkeveld]

On Sun, Jul 06, 2003 at 09:17:54AM -0700, Joshua Oreman wrote:
> On Sun, Jul 06, 2003 at 09:06:23AM -0700 or thereabouts, Terry Lambert wrote:
> > Josh Brooks wrote:
> > > Long story short, I have a 4gig vn-backed filesystem.  The file backing it
> > > is now missing the last 750megs ... I can vnconfig it, but when I fsck it
> > > I see:
> > 
> > Probably the first thing you'll want to do is write a small program
> > to open the file and write a zero at the offset of the 750M to make
> > the "device" the right size.  Most of the recovery tools, including
> > fsck, go into convulsions if the device size shrinks on them.  So the
> > first thing you want to do is change the size back to what it should
> > be.
> 
> He said it used to be 4gigs, so one would have to write a zero at 4gigs.
> Or do this (slower, but it works):
> $ dd if=/dev/zero bs=1m count=750 >> myfile

$ truncate -s <original_size> <file>

> -- Josh
> 
> > 
> > -- Terry

Paul Schenkeveld, Consultant
PSconsult ICT Services BV