Title: Page 94 – Alex Kirk --- * ## 󠀁[munin smart plugin: ignore error in the past](https://alex.kirk.at/2013/02/07/munin-smart-plugin-ignore-error-in-the-past/)󠁿 * February 7, 2013 * As a hard drive in my server failed, my [hosting provider](http://www.hetzner.de/) exchanged the drive with another one which obviously had some sort of error in its past, but now seems to be fully ok again. I would have wished to receive a drive without any problems but as my server is [RAID 1](http://en.wikipedia.org/wiki/Standard_RAID_levels#RAID_1), I can live with that. * I do my monitoring with [Munin](http://munin-monitoring.org/) and for monitoring my hard drives I use the [smart plugin](http://munin-monitoring.org/wiki/plugin-smart_). Now this plugin also monitors the exit code of smartctl, where smartctl sets bit no 6 if there was an error in the past, so now while everything is alright, the exit code is always numeric 64. * Now the smart plugin reports this as an error, if the exit code is > 0, i.e. now it always reports a problem. * I could set the threshold to 65, but then I wouldn’t be notified of other errors which essentially makes the plugin useless. * I asked at Serverfault but [no one seems to have a solution for that](http://serverfault.com/questions/461456/munins-smart-plugin-keeps-reporting-an-error-in-the-past-because-of-the-exit-co/461457). * So I attacked the problem on my own and patched the plugin. In the source code the important line is here: * ` if exit_status!=None : # smartctl exit code is a bitmask, check man page. num_exit_status=int(exit_status/256) * which I have modified to look like this: ` if exit_status!=None : # smartctl exit code is a bitmask, check man page. num_exit_status=int(exit_status/256) # filter out bit 6 num_exit_status &= 191 if num_exit_status<=2 : exit_status=None if exit_status!=None : * Now it doesn't bug me anymore when bit 6 is set, but if any other bit goes on again, I will still be notified. The most interesting part is the line where there is a bitwise operation with 191: this is 0x11011111 in binary, so doing an AND operation with the current value it will just set bit no 6 to 0 while letting the other values untouched. * Therefore a value of 64 (as mine does) will be reported as 0 while a value of 8 would remain at 8. But also, very importantly, a value of 72 (bit 6 set as always and bit 3 set because the disk is failing) it would also report 8. * And there we have another reason, why it is good to be firm with knowledge about how bits and bytes behave in a computer. Saved me from a warning message every 5 minutes :-) * [Code](https://alex.kirk.at/category/code/), [linux](https://alex.kirk.at/category/code/linux/) * ## 󠀁[Genial Daneben Analyse](https://alex.kirk.at/2012/12/23/genial-daneben-analyse/)󠁿 * December 23, 2012 * Zur Abwechslung mal ein Post auf deutsch. Ich bin Fan der (inzwischen abgesetzten) Fernsehsendung Genial daneben. Es gibt da eine [Genial Daneben Datenbank](http://genialdaneben.beepworld.de/) mit (nahezu) allen Fragen, die in den Sendungen vorkamen. Ohne konkreten Nutzen habe ich diese Daten aus der Text-Form in eine echte Datenbank konviertiert ( [Script hier](https://alex.kirk.at/dl/genial-daneben.zip?output_format=md&term_id=1122)) und bin zu folgender Tabelle gekommen. Für alle die es interessiert: * Fragen: 2732 (1087 beantwortet, das sind fast 40%) * | Teilnehmer | Teilnahmen | gelöst | gelöst pro Teilnahme | | Bernhard Hoecker | 399 | 223 | 0.56 | | Hella von Sinnen | 390 | 202 | 0.52 | | Wigald Boning | 120 | 56 | 0.47 | | Guido Cantz | 96 | 51 | 0.53 | | Barbara Schöneberger | 62 | 14 | 0.23 | | Dieter Nuhr | 62 | 18 | 0.29 | | Bastian Pastewka | 62 | 6 | 0.10 | | Ralf Schmitz | 60 | 6 | 0.10 | | Oliver Kalkofe | 55 | 6 | 0.11 | | Herbert Feuerstein | 47 | 25 | 0.53 | | Georg Uecker | 39 | 13 | 0.33 | | Olli Dittrich | 38 | 11 | 0.29 | | Oliver Welke | 37 | 11 | 0.30 | | Ingo Appelt | 32 | 8 | 0.25 | | Martin Schneider | 31 | 0 | 0.00 | | Michael Kessler | 29 | 6 | 0.21 | | Thomas Hermanns | 27 | 7 | 0.26 | | Anke Engelke | 26 | 8 | 0.31 | | Matze Knop | 23 | 2 | 0.09 | | Christoph Maria Herbst | 20 | 3 | 0.15 | | Mario Barth | 20 | 8 | 0.40 | | Jürgen von der Lippe | 19 | 3 | 0.16 | | Lou Richter | 19 | 7 | 0.37 | | Ingo Oschmann | 13 | 2 | 0.15 | | Guildo Horn | 13 | 1 | 0.08 | | Dirk Bach | 12 | 3 | 0.25 | | Kim Fisher | 12 | 1 | 0.08 | | Urban Priol | 10 | 2 | 0.20 | | Cordula Stratmann | 9 | 0 | 0.00 | | Eckart von Hirschhausen | 9 | 0 | 0.00 | | Tetje Mierendorf | 8 | 0 | 0.00 | | Oliver Pocher | 8 | 0 | 0.00 | | Bodo Bach | 8 | 0 | 0.00 | | Hennes Bender | 7 | 1 | 0.14 | | Rüdiger Hoffmann | 7 | 0 | 0.00 | | Elton | 7 | 1 | 0.14 | | Johann Köhnich | 7 | 0 | 0.00 | | Bürger Lars Dietrich | 7 | 2 | 0.29 | | Helge Schneider | 7 | 7 | 1.00 | | Anka Zink | 6 | 0 | 0.00 | | Hans Werner Olm | 6 | 0 | 0.00 | | Cindy aus Marzahn | 6 | 0 | 0.00 | | Kaya Yanar | 5 | 2 | 0.40 | | Mike Krüger | 5 | 2 | 0.40 | | Horst Lichter | 5 | 2 | 0.40 | | Susanne Pätzold | 5 | 1 | 0.20 | | Jochen Busse | 5 | 1 | 0.20 | | Karl Dall | 5 | 0 | 0.00 | | Mirja Regensburg | 4 | 1 | 0.25 | | Oli Petszokat | 4 | 2 | 0.50 | | Janine Kunze | 4 | 0 | 0.00 | | Michael Mittermeier | 4 | 0 | 0.00 | | Paul Panzer | 3 | 0 | 0.00 | | Florian Schroeder | 3 | 0 | 0.00 | | Konrad Stöckel | 3 | 2 | 0.67 | | Axel Stein | 3 | 0 | 0.00 | | Gayle Tufts | 3 | 1 | 0.33 | | Verona Pooth | 3 | 1 | 0.33 | | Zack Michalowski | 2 | 0 | 0.00 | | Atze Schröder | 2 | 1 | 0.50 | | Emily Wood | 2 | 1 | 0.50 | | Susanne Fröhlich | 2 | 0 | 0.00 | | Gabi Decker | 2 | 0 | 0.00 | | Helfried | 2 | 1 | 0.50 | | Mirja Boes | 2 | 1 | 0.50 | | April Hailer | 2 | 0 | 0.00 | | Michael “Bully” Herbig | 2 | 1 | 0.50 | | Roberto Cappelluti | 2 | 0 | 0.00 | | Olaf Schubert | 2 | 0 | 0.00 | | Sissi Perlinger | 2 | 0 | 0.00 | | Ottfried Fischer | 2 | 0 | 0.00 | | Klaus Eberhartinger | 2 | 0 | 0.00 | | Rick Kavanian | 2 | 0 | 0.00 | | Lisa Feller | 1 | 0 | 0.00 | | Sascha Korf | 1 | 0 | 0.00 | | Marc Metzger | 1 | 0 | 0.00 | | Joachim Fuchsberger | 1 | 1 | 1.00 | | Martin Klempnow | 1 | 0 | 0.00 | | Tom Gerhard | 1 | 0 | 0.00 | | Ralph Morgenstern | 1 | 1 | 1.00 | | Valerie Bolzano | 1 | 0 | 0.00 | | Kurt Krömer | 1 | 0 | 0.00 | | Hubertus Meyer-Burkhardt | 1 | 0 | 0.00 | | Smudo | 1 | 1 | 1.00 | | Badesalz (Gerd Knebel und Hendrik Nachtsheim) | 1 | 0 | 0.00 | | Markus Maria Profitlich | 1 | 1 | 1.00 | | Sven Nagel | 1 | 0 | 0.00 | | Bernd Stelter | 1 | 0 | 0.00 | | Matthias Matschke | 1 | 0 | 0.00 | | Otto Waalkes | 1 | 0 | 0.00 | | Till Hoheneder | 1 | 0 | 0.00 | | Waldemar Hartmann | 1 | 0 | 0.00 | | Lisa Fitz | 1 | 0 | 0.00 | | Fatih Cevikkollu | 1 | 0 | 0.00 | | Matze Knop (als Franz Beckenbauer) | 1 | 0 | 0.00 | | Ralf Morgenstern | 1 | 0 | 0.00 | | Ulrike von der Gröben | 1 | 0 | 0.00 | * Ich habe den Großteil der Daten nicht überprüft, aber im Groben dürfte es stimmen. * [Web](https://alex.kirk.at/category/web/) [Previous Page](https://alex.kirk.at/page/93/?output_format=md&term_id=1122) [Next Page](https://alex.kirk.at/page/95/?output_format=md&term_id=1122)