the C version of gmetad uses a slightly different RRD format. when you upgrade from the old gmetad .. you will need to start with fresh /var/lib/ganglia/rrds directory.
# cd /var/lib/ganglia # mv rrds rrds.old if it's important to convert your old data to 2.5.x format... let me know. it not trivial but it can be done. btw, the old data format had a single DS called "ganglia". the new format has 2: "num" and "sum". this newer format allows for easy calculation of averages. Thanks Matt, I was previously using v2.5.0, but cleared out the old rrds anyway. The good news is that the errors have gone (yay) - the bad news is that I still have no graphs (boo). I'm getting a very strong suspicion that it's not Ganglia that's causing the problems, but something in the rest of my setup - I've replaced the RRDTool rpms with a compiled version to no effect, php is next for scrutiny... Any other pointers to possible problem areas would be welcome. Barry
