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   6     <title>Petter Reinholdtsen: Entries Tagged raid</title>
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  13  <h1>
  14      <a href="http://people.skolelinux.org/pere/blog/">Petter Reinholdtsen</a>
  15
  16  </h1>
  17
  18 </div>
  19
  20
  21     <h3>Entries tagged "raid".</h3>
  22
  23     <div class="entry">
  24       <div class="title">
  25         <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>
  26       </div>
  27       <div class="date">
  28         14th February 2012
  29       </div>
  30       <div class="body">
  31         <p>Once in a while my home server have disk problems.  Thanks to Linux
  32 Software RAID, I have not lost data yet (but
  33 <a href="http://comments.gmane.org/gmane.linux.raid/34532">I was
  34 close</a> this summer :).  But once a disk is starting to behave
  35 funny, a practical problem present itself.  How to get from the Linux
  36 device name (like /dev/sdd) to something that can be used to identify
  37 the disk when the computer is turned off?  In my case I have SATA
  38 disks with a unique ID printed on the label.  All I need is a way to
  39 figure out how to query the disk to get the ID out.</p>
  40
  41 <p>After fumbling a bit, I
  42 <a href="http://www.cyberciti.biz/faq/linux-getting-scsi-ide-harddisk-information/">found
  43 that hdparm -I</a> will report the disk serial number, which is
  44 printed on the disk label.  The following (almost) one-liner can be
  45 used to look up the ID of all the failed disks:</p>
  46
  47 <blockquote><pre>
  48 for d in $(cat /proc/mdstat |grep '(F)'|tr ' ' "\n"|grep '(F)'|cut -d\[ -f1|sort -u);
  49 do
  50     printf "Failed disk $d: "
  51     hdparm -I /dev/$d |grep 'Serial Num'
  52 done
  53 </blockquote></pre>
  54
  55 <p>Putting it here to make sure I do not have to search for it the
  56 next time, and in case other find it useful.</p>
  57
  58 <p>At the moment I have two failing disk. :(</p>
  59
  60 <blockquote><pre>
  61 Failed disk sdd1:       Serial Number:      WD-WCASJ1860823
  62 Failed disk sdd2:       Serial Number:      WD-WCASJ1860823
  63 Failed disk sde2:       Serial Number:      WD-WCASJ1840589
  64 </blockquote></pre>
  65
  66 <p>The last time I had failing disks, I added the serial number on
  67 labels I printed and stuck on the short sides of each disk, to be able
  68 to figure out which disk to take out of the box without having to
  69 remove each disk to look at the physical vendor label.  The vendor
  70 label is at the top of the disk, which is hidden when the disks are
  71 mounted inside my box.</p>
  72
  73 <p>I really wish the check_linux_raid Nagios plugin for checking Linux
  74 Software RAID in the
  75 <a href="http://packages.qa.debian.org/n/nagios-plugins.html">nagios-plugins-standard</a>
  76 debian package would look up this value automatically, as it would
  77 make the plugin a lot more useful when my disks fail.  At the moment
  78 it only report a failure when there are no more spares left (it really
  79 should warn as soon as a disk is failing), and it do not tell me which
  80 disk(s) is failing when the RAID is running short on disks.</p>
  81
  82       </div>
  83       <div class="tags">
  84
  85
  86         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>.
  87
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