ifupdown hooks, to make sure the configuration is updated every time
the network setup changes.</p>
-The WPAD system is documented in a
+<p>The WPAD system is documented in a
<a href="http://tools.ietf.org/html/draft-ietf-wrec-wpad-01">IETF
draft</a> and a
<a href="http://en.wikipedia.org/wiki/Web_Proxy_Autodiscovery_Protocol">Wikipedia
-page</a> for those that want to learn more.
+page</a> for those that want to learn more.</p>
</div>
<div class="tags">
</div>
<div class="padding"></div>
+ <div class="entry">
+ <div class="title">
+ <a href="http://people.skolelinux.org/pere/blog/How_to_figure_out_which_RAID_disk_to_replace_when_it_fail.html">How to figure out which RAID disk to replace when it fail</a>
+ </div>
+ <div class="date">
+ 14th February 2012
+ </div>
+ <div class="body">
+ <p>Once in a while my home server have disk problems. Thanks to Linux
+Software RAID, I have not lost data yet (but
+<a href="http://comments.gmane.org/gmane.linux.raid/34532">I was
+close</a> this summer :). But once a disk is starting to behave
+funny, a practical problem present itself. How to get from the Linux
+device name (like /dev/sdd) to something that can be used to identify
+the disk when the computer is turned off? In my case I have SATA
+disks with a unique ID printed on the label. All I need is a way to
+figure out how to query the disk to get the ID out.</p>
+
+<p>After fumbling a bit, I
+<a href="http://www.cyberciti.biz/faq/linux-getting-scsi-ide-harddisk-information/">found
+that hdparm -I</a> will report the disk serial number, which is
+printed on the disk label. The following (almost) one-liner can be
+used to look up the ID of all the failed disks:</p>
+
+<blockquote><pre>
+for d in $(cat /proc/mdstat |grep '(F)'|tr ' ' "\n"|grep '(F)'|cut -d\[ -f1|sort -u);
+do
+ printf "Failed disk $d: "
+ hdparm -I /dev/$d |grep 'Serial Num'
+done
+</blockquote></pre>
+
+<p>Putting it here to make sure I do not have to search for it the
+next time, and in case other find it useful.</p>
+
+<p>At the moment I have two failing disk. :(</p>
+
+<blockquote><pre>
+Failed disk sdd1: Serial Number: WD-WCASJ1860823
+Failed disk sdd2: Serial Number: WD-WCASJ1860823
+Failed disk sde2: Serial Number: WD-WCASJ1840589
+</blockquote></pre>
+
+<p>The last time I had failing disks, I added the serial number on
+labels I printed and stuck on the short sides of each disk, to be able
+to figure out which disk to take out of the box without having to
+remove each disk to look at the physical vendor label. The vendor
+label is at the top of the disk, which is hidden when the disks are
+mounted inside my box.</p>
+
+<p>I really wish the check_linux_raid Nagios plugin for checking Linux
+Software RAID in the
+<a href="http://packages.qa.debian.org/n/nagios-plugins.html">nagios-plugins-standard</a>
+debian package would look up this value automatically, as it would
+make the plugin a lot more useful when my disks fail. At the moment
+it only report a failure when there are no more spares left (it really
+should warn as soon as a disk is failing), and it do not tell me which
+disk(s) is failing when the RAID is running short on disks.</p>
+
+ </div>
+ <div class="tags">
+
+
+ Tags: <a href="http://people.skolelinux.org/pere/blog/tags/english">english</a>, <a href="http://people.skolelinux.org/pere/blog/tags/raid">raid</a>.
+
+
+ </div>
+ </div>
+ <div class="padding"></div>
+
<p style="text-align: right;"><a href="02.rss"><img src="http://people.skolelinux.org/pere/blog/xml.gif" alt="RSS Feed" width="36" height="14" /></a></p>
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<li><a href="http://people.skolelinux.org/pere/blog/archive/2012/01/">January (7)</a></li>
-<li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (4)</a></li>
+<li><a href="http://people.skolelinux.org/pere/blog/archive/2012/02/">February (5)</a></li>
</ul></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/digistan">digistan (7)</a></li>
- <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (106)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/english">english (107)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/fiksgatami">fiksgatami (13)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/personvern">personvern (46)</a></li>
+ <li><a href="http://people.skolelinux.org/pere/blog/tags/raid">raid (1)</a></li>
+
<li><a href="http://people.skolelinux.org/pere/blog/tags/reprap">reprap (11)</a></li>
<li><a href="http://people.skolelinux.org/pere/blog/tags/rfid">rfid (2)</a></li>
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