<html><head><meta http-equiv="Content-Type" content="text/html charset=GB2312"><base href="x-msg://466/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Steve -<div><br></div><div>We do have a number of F5s, but they are at different datacenters, not configured in a cluster. We are seeing the same behavior at each.</div><div><br></div><div>I am looking at the statistics on the actual F5s today to see if they show the same pattern. That would rule out any issues with SNMP & MRTG.</div><div><br></div><div>- Matt</div><div><br><div><div>On Dec 18, 2012, at 7:00 PM, Steve Shipway <<a href="mailto:s.shipway@auckland.ac.nz">s.shipway@auckland.ac.nz</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div lang="EN-NZ" link="blue" vlink="purple" style="font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div class="WordSection1" style="page: WordSection1; "><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">That is really weird. We have an F5 too, but don’t experience this sort of pattern.<o:p></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "> </span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">It can’t be a counter reset at midnight, because that would only affect the first sample after that point. The graphs look almost like two separate things glued together, rather than a single event at midnight.<o:p></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "> </span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">My only guess would be some sort of scheduled task causing a failover. Do you have several F5 devices in a cluster? If so, it could be that at midnight (for some reason) one or more groups fail over to the other cluster member. This would result in fewer connections via the one you’re monitoring. Maybe check the logs to see if and when any cluster group failovers happen, or changes between active/active and active/passive on groups.<o:p></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "> </span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">I’d be interested to hear what the eventual resolution for this is.<o:p></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "> </span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Steve<o:p></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "> </span></div><div><div class="MsoNormal" align="center" style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; text-align: center; "><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><hr size="2" width="100%" align="center"></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><b><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Steve Shipway</span></b><b><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p></o:p></span></b></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 10pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">ITS Unix Services Design Lead<o:p></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 10pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">University of Auckland, New Zealand<o:p></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 10pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Floor 1, 58 Symonds Street, Auckland<o:p></o:p></span></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><i><span style="font-size: 10pt; font-family: Calibri, sans-serif; color: rgb(89, 89, 89); ">Phone: +64 (0)9 3737599 ext 86487<o:p></o:p></span></i></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><i><span style="font-size: 10pt; font-family: Calibri, sans-serif; color: rgb(89, 89, 89); ">DDI: +64 (0)9 924 6487<o:p></o:p></span></i></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><i><span style="font-size: 10pt; font-family: Calibri, sans-serif; color: rgb(89, 89, 89); ">Mobile: +64 (0)21 753 189<o:p></o:p></span></i></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><i><span style="font-size: 10pt; font-family: Calibri, sans-serif; color: rgb(89, 89, 89); ">Email:<span class="Apple-converted-space"> </span><a href="mailto:s.shipway@auckland.ac.nz" style="color: purple; text-decoration: underline; "><span style="color: rgb(89, 89, 89); ">s.shipway@auckland.ac.nz</span></a><o:p></o:p></span></i></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span lang="EN-GB" style="font-size: 18pt; font-family: Webdings; color: green; ">P</span><span lang="EN-GB" style="font-size: 11pt; font-family: Calibri, sans-serif; color: blue; "> </span><span lang="EN-GB" style="font-size: 10pt; font-family: 'Arial Narrow', sans-serif; color: green; ">Please consider the environment before printing this e-mail</span><span lang="EN-GB" style="font-size: 11pt; font-family: Calibri, sans-serif; color: blue; "><span class="Apple-converted-space"> </span>:<span class="Apple-converted-space"> </span></span><span style="font-size: 10pt; font-family: 'MS Gothic'; color: green; ">打印本</span><span style="font-size: 10pt; font-family: MingLiU; color: green; ">邮件，将减少一棵树存活的机会</span><span lang="EN-GB" style="font-size: 7.5pt; font-family: Verdana, sans-serif; color: navy; "><o:p></o:p></span></div></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "> </span></div><div style="border-style: none none none solid; border-left-width: 1.5pt; border-left-color: blue; padding: 0cm 0cm 0cm 4pt; "><div><div style="border-style: solid none none; border-top-width: 1pt; border-top-color: rgb(181, 196, 223); padding: 3pt 0cm 0cm; "><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><b><span lang="EN-US" style="font-size: 10pt; font-family: Tahoma, sans-serif; ">From:</span></b><span lang="EN-US" style="font-size: 10pt; font-family: Tahoma, sans-serif; "><span class="Apple-converted-space"> </span><a href="mailto:mrtg-bounces+s.shipway=auckland.ac.nz@lists.oetiker.ch" style="color: purple; text-decoration: underline; ">mrtg-bounces+s.shipway=auckland.ac.nz@lists.oetiker.ch</a><span class="Apple-converted-space"> </span>[mailto:mrtg-<a href="mailto:bounces+s.shipway=auckland.ac.nz@lists.oetiker.ch" style="color: purple; text-decoration: underline; ">bounces+s.shipway=auckland.ac.nz@lists.oetiker.ch</a>]<span class="Apple-converted-space"> </span><b>On Behalf Of</b>Mathew Marulla<br><b>Sent:</b><span class="Apple-converted-space"> </span>Wednesday, 19 December 2012 1:16 a.m.<br><b>To:</b><span class="Apple-converted-space"> </span><a href="mailto:mrtg@lists.oetiker.ch" style="color: purple; text-decoration: underline; ">mrtg@lists.oetiker.ch</a><br><b>Subject:</b><span class="Apple-converted-space"> </span>[mrtg] Discontinuity at midnight<o:p></o:p></span></div></div></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; ">Is it normal to see values jump suddenly at midnight? Is something getting in SNMP or MRTG getting reset? I am seeing this in both normal and gauge type graphs. Don't believe there is anything getting reset on the server (an F5 Big-IP load balancer, in this case).<o:p></o:p></div><div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></div></div><div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; ">- Matt<o:p></o:p></div><div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></div></div><div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span><image001.png></span><o:p></o:p></div></div><div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></div></div><div><div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; "><span><image002.png></span></div></div></div></div></div></div></blockquote></div><br></div></body></html>