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Veranstaltungen/2009-12-04 ZFS-Workshop/Etwas Statistik - Versionsgeschichte
2026-05-11T23:06:47Z
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Sdk: Sdk verschob die Seite ZFS-Workshop/Etwas Statistik nach Veranstaltungen/2009-12-04 ZFS-Workshop/Etwas Statistik
2022-04-14T06:44:52Z
<p>Sdk verschob die Seite <a href="/ZFS-Workshop/Etwas_Statistik" class="mw-redirect" title="ZFS-Workshop/Etwas Statistik">ZFS-Workshop/Etwas Statistik</a> nach <a href="/Veranstaltungen/2009-12-04_ZFS-Workshop/Etwas_Statistik" title="Veranstaltungen/2009-12-04 ZFS-Workshop/Etwas Statistik">Veranstaltungen/2009-12-04 ZFS-Workshop/Etwas Statistik</a></p>
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<td colspan="1" style="background-color: #fff; color: #202122; text-align: center;">Version vom 14. April 2022, 06:44 Uhr</td>
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Rabe: {{:ZFS-Workshop/Navigation}}
2010-01-12T08:26:41Z
<p>{{:ZFS-Workshop/Navigation}}</p>
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Rabe
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SHL: Navigation eingebaut
2009-12-03T16:58:53Z
<p>Navigation eingebaut</p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Version vom 3. Dezember 2009, 16:58 Uhr</td>
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<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[ZFS-Workshop/Agenda|Agenda]] | [[ZFS-Workshop/Wie schnell etwas passieren kann|Wie schnell etwas passieren kann]]</ins></div></td></tr>
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https://wiki.uugrn.org/index.php?title=Veranstaltungen/2009-12-04_ZFS-Workshop/Etwas_Statistik&diff=8605&oldid=prev
SHL: draft
2009-11-26T10:39:45Z
<p>draft</p>
<p><b>Neue Seite</b></p><div>'''''Früher ging man von riesigen Zahlen aus, und "das passiert statistisch nie" - heute sind wir bei "nie" angekommen.'''''<br />
<br />
== einige mögliche Fehler ==<br />
<br />
''Es gibt drei unterschiedliche Fehler, die aufkommen können...''<br />
<br />
* Disk-Errors<br />
** höhere Dichte an Daten (''bits per square inch'')<br />
** Festplatten Firmware enthält Fehler (im Schnitt 400.000 lines of code)<br />
** z.B. Phantom-Writes, misdirected writes<br />
** "bit spillover" (die "Spur" wird nicht gehalten, und der Kopf schreibt falsch)<br />
** single bit errors (''~10% aller Fehler'')<br />
** latent sector oder page errors (''~10% aller Fehler'')<br />
** korrupte Daten über mehrere Blöcke (''~80% aller Fehler'')<br />
*** silent corruption<br />
*** transient corruption (geht, geht nicht, geht, geht nicht...)<br />
<br />
<br />
* RAID-Errors <br />
** ein RAID schützt nicht vor korrupten Daten<br />
** ein RAID schützt '''nur''' vor defekten Festplatten<br />
** mögliche Fehler in der RAID-Firmware<br />
** RAID 5 "write-hole"<br />
<br />
<br />
* Memory-Errors<br />
** ECC vs. non-ECC<br />
** double-bit errors werden auch von ECC nicht erkannt<br />
** Fehler werden nicht erkannt und '''damit Daten falsch auf die Platten geschrieben'''<br />
<br />
<br />
''... und alle enden im Desaster!''<br />
<br />
Im Schnitt: '''eine (1!) korrupte Datei auf 1500 (!) Dateien!'''<br />
<br />
Nur um das mal vor Augen zu führen...:<br />
<pre>shl@shell /usr/ports % ls -1R | grep -v ./ | wc -l<br />
141448</pre><br />
<br />
141448 Dateien enthalten also statistisch '''94 defekte Dateien'''!<br />
<br />
Nein, so schlecht ist die Welt nicht. Aber das sind die Größenordnungen in denen wir uns heute bewegen!<br />
<br />
<br />
----<br />
''Quellen:''<br />
* Video SunDay 2009, Erlangen, Ralph Hinsche, http://www.video.uni-erlangen.de/cgi-bin/index.pl/Clip/619<br />
** Paper "Data Integrity", Bernd Panzer-Steindel, CERN April 2007<br />
** Dissertation "Iron File Systems", Vijayan Prabhakaran, 2006<br />
** "Analysing the Impact of File Formats on Data Integrity", Volker Heydegger, 2008<br />
* diverse Blogs zum Thema Data Integrity<br />
<br />
[[Kategorie:ZFS]]<br />
[[Kategorie:ZFS-Workshop]]</div>
SHL