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</o:shapelayout></xml><![endif]--></head><body lang=EN-NZ link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>This is not a problem with rrdcached; it is because you are trying to update too frequently.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>rrdupdate to /usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-idle.rrd at 1398215351 sec, 387208 usec<br>rrdupdate to /usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-idle.rrd at 1398215351 sec, 395156 usec<br><br></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The error message you give seems to indicate that rrdcached is being told to update with the time not changing or even going backwards. This most likely indicates a problem with your script that does the update calls – this should only happen once every step. How long is a Step? This depends on how you created the RRD files, but usually it is 60s or 300s.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Try this command, which will tell you your Step size:<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>rrdtool info </span><span style='font-family:"Calibri","sans-serif"'>/usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-idle.rrd</span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> | grep step<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The two lines above show you are trying to update twice at time </span><span style='font-family:"Calibri","sans-serif"'>1398215351 </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> (the usec do not matter). This is way too quickly and gives the error. Your update script should sleep by Step seconds before trying another update.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Steve<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Steve Shipway<o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>s.shipway@auckland.ac.nz<o:p></o:p></span></p></div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> rrd-users-bounces+s.shipway=auckland.ac.nz@lists.oetiker.ch [mailto:rrd-users-bounces+s.shipway=auckland.ac.nz@lists.oetiker.ch] <b>On Behalf Of </b>Hassan Noureddine<br><b>Sent:</b> Wednesday, 23 April 2014 2:39 p.m.<br><b>To:</b> rrd-users@lists.oetiker.ch<br><b>Subject:</b> [rrd-users] rrdcached updating too fast<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>Hi all,<br><br>I was debugging the root cause of getting a long list of rrdcached log errors. like the on below. ( Illegal attempt to update in less than 1 sec. step).<br><br><span class=error>[err]</span> collectd<span class=error>[3565]</span>: rrdcached plugin: rrdc_update (/usr/var/.../df-root/df_complex-free.rrd, <span class=error>[1386607176:21342183424.000000]</span>, 1) failed with status -1.<br><br>The rrdcached is configured to update every 10 seconds, but when running scripts consuming memory, and cpu usage, I can see single update for some RRDs happening very frequent, causing long list of error logs.<br><br>I added debug codes to display update time, once I ran the scripts, I see the updates occur much faster for some of the RRDs. I am listing son below.<br><br>rrdupdate to /usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-idle.rrd at 1398215341 sec, 387199 usec<br>rrdupdate to /usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-idle.rrd at 1398215351 sec, 387208 usec<br>rrdupdate to /usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-idle.rrd at 1398215351 sec, 395156 usec<br>rrdcached plugin: rrdc_update (/usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-idle.rrd, [1398215351:36382], 1) failed with status -1.<br>rrdupdate to /usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-idle.rrd at 1398215362 sec, 958488 usec<br>rrdupdate to /usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-idle.rrd at 1398215371 sec, 393588 usec<br><br>rrdupdate to /usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-steal.rrd at 1398215341 sec, 387544 usec<br>rrdupdate to /usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-steal.rrd at 1398215351 sec, 387590 usec<br>rrdupdate to /usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-steal.rrd at 1398215351 sec, 488583 usec<br>rrdcached plugin: rrdc_update (/usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-steal.rrd, [1398215351:0], 1) failed with status -1.<br>rrdupdate to /usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-steal.rrd at 1398215362 sec, 958920 usec<br>rrdupdate to /usr/var/lib/collectd/rrd/localhost/cpu-7/cpu-steal.rrd at 1398215371 sec, 393950 usec<br><br>Have this issue been addressed, and if not, which part of the code could be causing it.<br><br>Thanks.<o:p></o:p></span></p></div></div></body></html>