[hobbit] strange graph behavior - random machines & graphs

[Hubbard, Greg L]

Gary,
 
This is pretty hard to decipher from "afar".
 
I think I remember you saying that when you dump the data it is always
okay?
 
Some wild thoughts:
 
a) could there be two different processes updating the same RRD files?
 
b) are all servers using the same version of rrdtool?
 
c) are the hobbitgraph files okay?  I have proven to my satisfaction
that hobbitgraph definition errors can make the graphs act funny.
 
d) if this stuff is on a SAN, can it be moved to local storage?
 
I am just "fishing."  Sometimes, when I am at my wit's end, I just
change SOMETHING to see if it makes a difference. Even WORSE can help
get me started.
 
GLH


________________________________

	From: Gary Baluha [mailto:gumby3203 at gmail.com] 
	Sent: Friday, November 30, 2007 9:25 AM
	To: hobbit at hswn.dk
	Subject: Re: [hobbit] strange graph behavior - random machines &
graphs
	
	
	Now this appears it is becoming a more serious problem.  It
seems more and more graphs are starting to be affected, and I still have
no explanation for what is going on here.  It also seems that almost any
new graph that is created (such as if I delete/rename/move an existing
.rrd file), it immediately starts off being corrupted. :-( 
	
	
	On Nov 28, 2007 10:08 AM, Gary Baluha <gumby3203 at gmail.com>
wrote:
	

		I have recently noticed a strange thing happening with
some of the rrd graphs generated by Hobbit.  When you look at the graph,
it looks as though the rrd data is one one format (gauge), but the graph
is generating it in a different format (derive).  I can't seem to find
any pattern to the hosts or tests that are exhibiting this strange
behavior, and it is only happening on a handful of graphs.  I have
attached a picture of one of these graphs, since I'm not really sure how
to describe it.  Note the huge numbers displayed on the curr/min/avg/max
line. 
		 
		Any idea what's going on here?  When I dump the RRD file
manually, everything looks okay.  I'm running Hobbit 4.2.0 with the
2007-02-09 allinone patch (I believe the latest).  This has only
happened in the past few weeks, though when exactly it started, I don't
know.  Any ideas? 


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