Unable to recover hammer volume.

jscottkasten at yahoo.com jscottkasten at yahoo.com
Mon Jan 16 06:09:18 PST 2017

----- Original Message -----
From: PeerCorps Trust Fund <ipc at peercorpstrust.org>

>It sounds pretty much like its supposed to operate if your file system tree is potentially
>corrupted somehow. You may very well need to copy off the data and recreate the file system. Unless
>of course the underlying block storage has some issues (bad sectors etc.).

That's unfortunately the only thing I've come up with at the moment is to reformat and recopy.  Just wanted to check the collective knowledge before blowing away 2TB of stuff.  :-)

>I do recall there not yet being a way to gracefully fix a "broken" HAMMER file system.

That's kind of what I saw too.  Found lots of comments about collecting data and studying the problem (during various phases of hammer development), but nothing about actually recovering the volume.

>Perhaps I am wrong and someone else will offer more enlightened feedback.

Keeping fingers crossed...

>Out of curiosity when the file system was mounted at boot, did it not fail to mount?
>It seems like it should have been brought back to a consistent state after your reboot.

The file system mounts just fine.  Reports no errors.  It's only when I traverse into an affected folder (I.E. rm -rf *, or rsync ...) that I get this "critical error" and things go read only.  It's some sort of oddly corrupted inode.


Thanks for your comments.


On 01/16/2017 03:32 PM, jscottkasten at yahoo.com wrote:
>> Hi guys,
>> I've tried searching the answer for this, but cannot find any proper discussion on the topic.
>> I have a hammer volume that had to be forced into an unclean shutdown.  There are some files and/or folders that now have CRC errors.  When the damaged data is encountered, it causes hammer to report a critical error and remount the file system as READ ONLY.  Thus, I am unable to delete or remove the bad data in any way to recover the file system to an operable state.
>> Is there some tool that I should run on the file system to do this???  I know the bad data is restricted to a small number of folders.  Would love to somehow purge it so the volume can be returned to normal operation.  It's a 2TB volume, so I'm hoping I don't have to reformat and re-create the volume.
>> Thanks for any advice.
>> Regards,
>> -J. Scott Kasten-

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