[hobbit] Question about using no-cache on rrd for xymon

Stewart, Tom L. Tom.Stewart at landsend.com
Sat Nov 14 00:20:10 CET 2009

I am able to give a little better update watching the .rrd files.

It always happens 1 hour apart for three times.
Xymon does not update the .rrd files for procs, users and la.

For example.

14:50 no update graph is blank between 14:45 and 14:55
15:50 no update graph is blank between 15:45 and 15:55
16:40 no update graph is blank between 16:45 and 16:55
Watching the time stamps on the files, I saw the following:

On procs.rrd, users.rrd and la.rrd at 16:46 all files were time stamped
including the rest of the .rrd files.
At 16:51 NO time stamp on procs.rrd, users.rrd, and la.rrd. All other
.rrd files were time stamped with 16:51
At 16:56 all files show proper time stamp again.

This is happening at different times on different machines, however when
I see two missing data points one hour apart, I can set my watch and see
the third missing data point one hour later.

Since this is still happening after I added the --no-cache flag, I am
still waiting to see if I added the flag properly since it does not seem
to make a difference.


Here are the packages for rrd that were installed.


Since I see that the three rrd files are not getting timestamped for the
one time, I would assume that it is something within Xymon. Again, I do
see any messages in the log files for either the client or server.

Thank you,

-----Original Message-----
From: Alan Sparks [mailto:asparks at doublesparks.net] 
Sent: Friday, November 13, 2009 3:29 PM
To: hobbit at hswn.dk
Subject: Re: [hobbit] Question about using no-cache on rrd for xymon

Stewart, Tom L. wrote:
> So it looks like it is in effect, but looking at the tmp file I still
> see the following:
> srw-rw-rw- 1 xymon xymon        0 Nov 13 14:26 rrdctl.7672
> srw-rw-rw- 1 xymon xymon        0 Nov 13 14:26 rrdctl.7681
> When I stop and restart xymon I still get messages such as: 
> rrd-status.log:2009-11-13 14:26:09 Cache flush completed
> rrd-status.log:2009-11-13 14:26:18 Peer not up, flushing message queue
> So my question is have I placed the -no-cache in the wrong sequence on
> the startup command or is that been taken out of beta-2?

The more poignant question is, are you still seeing the update lags? 
And are the timestamps on the actual RRD files changing (not the rrd
channel control files, as you show)?  The option does exist in
xymon-4.3.0-beta2 source.

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