Date: Sun, 6 Jul 2003 19:17:26 +0200 From: Paul Schenkeveld <fb-hackers@psconsult.nl> To: hackers@freebsd.org Subject: Re: recovering data from a truncated vn-file possible? Message-ID: <20030706171726.GA66532@psconsult.nl> In-Reply-To: <20030706161754.GA30740@webserver.get-linux.org> References: <20030704015704.Y57224-100000@mail.econolodgetulsa.com> <3F0848FF.A386477C@mindspring.com> <20030706161754.GA30740@webserver.get-linux.org>
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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
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