Re: [9fans] fossil file system corrupts after a power cut

[kin loo <kinloo88@gmail.com>]

On Jul 26, 3:55 pm, 0in...@gmail.com (David du Colombier) wrote:
> > fossil/flfmt -v da39a3ee5e6b4b0d3255bfef95601890afd80709 /dev/sdC0/fossil
> > fatal error: corrupted root: vtRootUnpack
>
> This Venti score is wrong. This is the Venti score returned by an empty
> Fossil file system. That's why it cannot be found in Venti.
>
> > /boot/fossil: cacheLocalData: addr=1 type got 0 exp 8: tag got 0 exp 1
> > /boot/fossil: fsOpen error fsOpen: block label mismatch fsys main
>
> The type VtDataType was returned instead of VtDirType and the tag
> BadTag was returned instead of RootTag. Obviously, something got wrong.
>
> It looks like your virtual hard disk image was corrupted
> because of the the power outage. Especially since you used
> the dynamically-growing qcow2 image format.
>
> You should make another hard disk image and rebuild
> Fossil from your last Venti score.
>
> Since this score cannot be found in your Fossil super block, you
> should extract a list of your Vac scores from your Venti server
> with the script /sys/src/cmd/venti/words/dumpvacroots.
>
> --
> David du Colombier

Thank you David du Colombier, it works. I can now use the most recent
score produced by dumpvacroots to restore  the active and archive data
in a new qemu image. But the original 9fat partition still keeps in
the old qcow2 image.