hammer_load_node CRC B-TREE @ NODE very_big_number/4096 FAILED

Matthew Dillon dillon at backplane.com
Sun Jul 8 11:47:46 PDT 2018

It looks like the storage got corrupted in the B+Tree itself, which is
likely fatal.  The best solution is to format a fresh filesystem and
restore from a backup.  If you don't have any backups then you may be able
to recover the broken hammer filesystem using an offline scan.  For that,
though, you need to set the drive aside and put in a new fresh drive with a
fresh install of DFly on it.  Then attach the old drive via a second sata
port and use hammer's off-line 'recover' directive to scan the broken media
and reconstruct the filesystem to a subdirectory on the live drive.  You
can't recover the broken media in-place.


On Thu, Jul 5, 2018 at 7:56 PM, Antonio Olivares <olivares14031 at gmail.com>

> Dear kind folks,
> I have an older machine that I use at home.  No internet available
> dragonfly 4.3.x since April 2016 no updates.  I am encountering the errors
> mentioned above.  I tried fsck, but since the filesystem is not UFS, it
> does not work.  I have tried in single user mode to try recover working
> system, but to no avail.  One time, there was a power outage and machine
> refused to work.  I unplugged it for about a week, then replugged it and I
> tried and it worked.  This time I am not lucky :(.
> I cannot get it to work again.
> Ideas/suggestions/advice are welcome.
> Best Regards,
> Antonio
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