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

[cleaver at terabithia.org]

Do you see anything unusual in the xymond_rrd or xymond log(s) around that
time? If messages are dropping to zero, it could definitely be a crash
somewhere.

If nothing interesting shows up, try running both with --debug enabled as
well... We might get a better idea of why that's happening.

Regards,

-jc


> 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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