[Gllug] XFS_repair cannot find master or secondary superblocks

[Bruce Richardson]

On Fri, Mar 03, 2006 at 10:00:07PM +0000, John wrote:
> On Fri, 2006-03-03 at 21:30 +0000, Simon Morris wrote:
> > On 03/03/06, Tethys <sta296 at astradyne.co.uk> wrote:
> > >         A copy on disk is _not_ a backup.
> Dirvish http://www.dirvish.com/

Dirvish relies on hard links.  The most obvious limitation there is that
all your "copies" have to be on the same disk and thus all vulnerable
to being wiped out by the same disk failure.  Also, since you only have
one actualy copy of any file that hasn't changed, much of the data is
extremely vulnerable to partial filesystem or some dopy admin copying
one backed-up file over another.

You also see interesting problems caused by the
many-hard-links-one-inode situation.  For example, changing the
permissions or ctime on one "copy" changes it for all of them.
That's information lost and sometimes this is important.


> 
> I now expect both sides in this argument to chase their tails in ever
> decreasing circles till they implode :-)

You can't really toss a bone into the dog-pit and then claim to be above
it all, John.  Naughty.

-- 
Bruce

I must admit that the existence of Disneyland (which I know is real)
proves that we are not living in Judea in AD 50. -- Philip K. Dick
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