blog/How_to_figure_out_which_RAID_disk_to_replace_when_it_fail.html

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