[rrd-users] rrd resize error

[Daniel De Marco]

Hi, 

I'm trying to resize some rrd files to add more rows to the RRAs and I
get the "ERROR: attempting to write beyond end of file" mentioned in the
following thread ( https://lists.oetiker.ch/pipermail/rrd-users/2011-January/017476.html ).

The thread stopped at the message attached below. Did anybody find a
solution or workaround?

$ rrdtool create pippo.rrd DS:test:GAUGE:120:0:U RRA:AVERAGE:0.5:1:244
$ rrdtool resize pippo.rrd 0 GROW 10
ERROR: attempting to write beyond end of file

Thank you, Daniel.

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On Wed, Jan 19, 2011 at 09:12:19AM +0100, Tobias Oetiker wrote:
> Hi Stefan,
> 
> Today Stefan Brandl wrote:
> 
> >
> > Sorry Tobi, but my C-Programming knowledge is very limited,
> > not to say non-existent :-(
> > Could you tell me, where to put what code to further debug this?
> 
> I would guess something like this could serve:
> 
> Index: rrd_open.c
> ===================================================================
> --- rrd_open.c  (revision 2172)
> +++ rrd_open.c  (working copy)
> @@ -671,7 +671,7 @@
> 
>      if((rrd_file->pos + count) > old_size)
>      {
> -        rrd_set_error("attempting to write beyond end of file");
> +        rrd_set_error("attempting to write beyond end of file (%ld +
> %ld > %ld)",rrd_file->pos, count, old_size);
>          return -1;
>      }
>      memcpy(rrd_simple_file->file_start + rrd_file->pos, buf, count);
> 

Ok, thanks.
This gives:

noc at lowrider:~$ 
noc at lowrider:~$ /opt/rrdtool-1.4.5.002170/bin/rrdtool create
tester.rrd DS:inet:GAUGE:600:0:U RRA:AVERAGE:0.5:1:600
noc at lowrider:~$ /opt/rrdtool-1.4.5.002170/bin/rrdtool resize
tester.rrd 0 GROW 100
ERROR: attempting to write beyond end of file (6144 + 8 > 6148)
noc at lowrider:~$ 


Stefan

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