Analysis of disk file block with ZFS checksum error
Alfred Perlstein
alfred at freebsd.org
Fri Feb 8 23:02:08 UTC 2008
* Joe Peterson <joe at skyrush.com> [080208 14:58] wrote:
> Mark Day wrote:
> > Based on the subset of data you posted, the bad data looks like ASCII
> > text.
> > The bad data from offset a0000 to a000f is:
> >
> > ${138AFE{@
> > @$$}1
> >
> > The bad data from offset af6c1 to af6c8 is:
> >
> > 392A9}@
> >
> > I don't recognize the content beyond that, but I'd guess that somehow
> > the
> > contents of some other file managed to overwrite that portion of the bad
> > file. As for how that happened, I don't know. But if someone
> > recognizes
> > where the bad content came from, that might be a clue.
>
>
> Gary/Mark,
>
> Good eye! Yes, it indeed does appear to be ASCII. I *thought*
> something in the repetition when I originally did an od -a looked
> interesting.
>
> I dumped the whole bad section as a string, and here's (partly) what I get:
>
> ${138AFE{@
> @$$}138AFE}@
>
> @$${138AFF{@
> [A3:^80(^91^2146F)]
> @$$}138AFF}@
>
> @$${138B00{@
Looks like terminal output/codes that have been stripped...
-Alfred
More information about the freebsd-stable
mailing list