[Xymon] white gaps in graphs across a number of services

[Vincent Baines]

Hi Everyone,



Have been looking on and off at a problem I've seen for a while now, without massive success. I see intermittant 'white gaps' occuring in xymon results across a number of services, and sometimes at corresponding times, but sometimes not. Most frequently I see this gap for CPU load, and this isn't just specific to one server.

Attached is an example of useres and processes from one client server. There is a corresponding gap for the approx 3AM gap in CPU utilization graphs, memory graphs, actually, all of them I think, and a large 300second spike in clock offset at that time. But, nothing corresponding to the other gaps.



If I look at the xymon server itself, it looks like there was something up at that time too, as xymond incoming messages drops to zero. But, for the rest of the day,  it holds at a steady number. But, theres are gaps all over the place in xymonnet runtime, CPU utilization, users and procs, etc.



I seem to recall we did try to tweak some rrd cache value as it cropped up in another post, which I think improved things slightly. But, we are having problems with the platforms that we're trying to monitor, with apparent long NFS pings between boxes.



The xymon server itself is running on a VM box. Has anyone had issues running on VM?



As best I can figure, either we have a xymon config issue, the xymon box itself isn't stable and it dropping data, or we have genuine network / disk write issues..



Any other thoughts?



Cheers!

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