DragonFly users List (threaded) for 2009-05
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DragonFly users List (threaded) for 2009-05
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Re: Hammer error?

From: Sdävtaker <sdavtaker@xxxxxxxxx>
Date: Wed, 20 May 2009 10:44:39 -0300

I will check with the debugger later, but i can tell in advance that i
found the trigger, i could reproduce the error :-)

Machine0 has  standard out of the box hammerFS from installer, used
for 2-3 months, now 30GB in /home, it's a server, it has a public
static IP for his own.
Machine1 fresh install same structure, running in a VM in my home
behind a router, behind a ADSL (Dynamic-ip)
I forwaded the ADSL port 22 to the Machine1, checked my ip address at
the moment and ran:

Machine0# hammer pfs-status /home   //to get shared-uuid
Machine1# hammer pfs-slave /pfs/machine0.home shared-uuid=******
Machine0# hammer mirror-copy /home root@Machine1IpAddress:/pfs/machine0.home
It took a couple of hours (30GB) and sometime in the run the public
address of my ADSL modem changed (not the internat, im still
Then i got a hammer.core in my root's home.
I think there is nothing to do about this just do the copy in small
chunks, right?

On Tue, May 19, 2009 at 22:49, Matthew Dillon
<dillon@apollo.backplane.com> wrote:
> :Hello,
> :I was doing some backup from Machine0 to Machine1 using hammer
> :mirror-copy and got a suppicious new file called "hammer.core".
> :Looking around the files it looks like a success copy but i still
> :curious about this new 720kb file.
> :Someone can tell me if i need to worry about it and where can i start
> :checking for errors in case there was one?
> :Machine0 has DFBSD2.2.0-release, Machine1 has DFBSD2.2.1-release,
> :could it be the problem? should i just upgrade both?
> :Sdav
>   A hammer.core could only come from the hammer utility core dumping.
>   This wouldn't be a filesystem error but it certainly indicates a bug
>   somewhere in the hammer utility.
>   If you haven't updated the sources relative to when the core was
>   generated you can recompile the hammer utility with DEBUG_FLAGS=-g and
>   then gdb the binary and core file and get a backtrace to see where it
>   died.
>   If you have updated the sources since then you'd have to wait for a new
>   core file to be generated for a newly debug-compiled hammer utility to
>   match the core file.
>       cd /usr/src/sbin/hammer
>       make clean
>       make obj
>       make DEBUG_FLAGS=-g all install
>       ...
>       gdb /sbin/hammer hammer.core
>       ...
>       gdb> back
>                                        -Matt
>                                        Matthew Dillon
>                                        <dillon@backplane.com>

Sdävtaker prays to Rikku goddess for a good treasure.

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