[rrd-users] rrd resize error

[Tobias Oetiker]

Hi Daniel,

Yesterday Daniel De Marco wrote:

> 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?

only in the sense that I was not able to reproduce this on our
systems ... it would be great to figure the cause of this ...

cheers
tobi
>
> $ 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.
>
> --------------------------------------------------------------------------------
>
> 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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>

-- 
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900