[rrd-users] Errors on create/update/lastupdate like Ticket #303

ekgnkb3d achimrs at gmx.de
Mon Oct 3 21:46:18 CEST 2011

Hello all,
I've used RRDTOOL at version 1.0 since years now - but since upgrading to a
new hardware + version 1.4 I now have annoying problems.

My machine is an ARM CPU on flash formatted with jffs2 file-system.
If creating an .rrd in my home directoy with 
 "rrdtool create ~/foo.rrd --start 1308752772 DS:bar:GAUGE:60:U:U
the .rrd file is generated, but I get an 
  "ERROR: creating 'foo.rrd': Invalid argument"
This error message can't be ignored, because in case of inserting new
datapoints with:
  "rrdtool update ~/foo.rrd N:0"
I get an:
  "ERROR: mmaping file 'foo.rrd': Invalid argument"
Also if trying to read somthing out with:
  "rrdtool lastupdate foo.rrd"
will lead to an:
  "ERROR: 'foo.rrd' is not an RRD file"

If doing the same on /tmp/foo.rrd, which is mounted as tmpfs, it works
flawless - very much like described in Ticket #303.
I can't understand, out of the tickets text, what can be done to prevent
this errors and making the created file accessable. How to create and use
.rrd files with version 1.4 on jffs2 filesystem?

Thanks a lot

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