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<p class="MsoNormal"><span lang="EN-US">On Thu, 4 Mar 2021 at 21:44, Carl Melgaard <</span><a href="mailto:Carl.Melgaard@stab.rm.dk"><span lang="EN-US">Carl.Melgaard@stab.rm.dk</span></a><span lang="EN-US">> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana",sans-serif">Hi,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana",sans-serif">How serious is gaps in graphs – for instance disk-graphs etc. Is a gap the same as potential missing
alerting on events?</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana",sans-serif">Regards,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana",sans-serif"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana",sans-serif">Carl Melgaard</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="color:black">></span><span lang="EN-US">Yes, usually gaps in graphs are caused by missing data points.
</span>In the case of the disk graph, this is usually caused by missing client data messages that are not being sent from host to Xymon server, for some reason - such as stopping the Xymon client at just the wrong time.
<span lang="EN-US">It's also <span style="color:black">></span>possible that client data messages are not being sent in a timely manner - if two data points are fed into RRD within the same 5-minute interval, the second one is ignored, and then the next 5-minute
interval with have no data point.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="color:black">></span><span lang="EN-US">One unlikely cause of missing graphs is that the client data message is being truncated.
</span>If the disk stats are after the point of truncation, then there are no data points to add to the RRD file, so you'll see a gap.
<span lang="EN-US">I would check your xymond.log file for messages like "Oversize data/client msg
<span style="color:black">></span>from 10.1.1.1 truncated n=<msgsize>, limit <msglimit>).
</span>If disk graphs are affected by a section earlier in the message, it's likely that other graphs are also affected by this - the [df] section is followed by [free] (memor), then [ifconfig] and all the other sections used for network stats.
<span lang="EN-US" style="color:black">></span><span lang="EN-US">Perhaps scan down the graphs on the trends page looking for similar gaps.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="color:black">></span><span lang="EN-US">I've seen client data message truncation cause missing data points, but, it's actually unlikely this is the cause of your problem.
</span>All of the client data sections that are likely to cause truncation are after the sections that are used for the standard graphs (including disk). But it couldn't hurt to
<span style="color:black">></span>check. Message limit defaults can be changed in the xymonserver.cfg file - search the man page for MAXMSG_CLIENT for more details.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span lang="EN-US" style="color:black">></span><span lang="EN-US">If the cause is something else, I suspect you'll still find clues in your xymond.log file.
</span>But also check rrd-data.log and rrd-status.log.<o:p></o:p></p>
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<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black">It is indeed wrong with more graphs than just disk. I’ll look around – thanks for the pointers.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black">Carl<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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