From: Petter Reinholdtsen Date: Wed, 15 Feb 2012 17:43:02 +0000 (+0000) Subject: Generated. X-Git-Url: https://pere.pagekite.me/gitweb/homepage.git/commitdiff_plain/37f0de1062c404482eed7c8f26decb52666dbc41?ds=sidebyside Generated. --- diff --git a/blog/tags/raid/index.html b/blog/tags/raid/index.html new file mode 100644 index 0000000000..b46f246a4d --- /dev/null +++ b/blog/tags/raid/index.html @@ -0,0 +1,298 @@ + + + + + Petter Reinholdtsen: Entries Tagged raid + + + + + +
+

+ Petter Reinholdtsen + +

+ +
+ + +

Entries tagged "raid".

+ +
+
+ How to figure out which RAID disk to replace when it fail +
+
+ 14th February 2012 +
+
+

Once in a while my home server have disk problems. Thanks to Linux +Software RAID, I have not lost data yet (but +I was +close 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.

+ +

After fumbling a bit, I +found +that hdparm -I 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:

+ +
+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
+
+ +

Putting it here to make sure I do not have to search for it the +next time, and in case other find it useful.

+ +

At the moment I have two failing disk. :(

+ +
+Failed disk sdd1:       Serial Number:      WD-WCASJ1860823
+Failed disk sdd2:       Serial Number:      WD-WCASJ1860823
+Failed disk sde2:       Serial Number:      WD-WCASJ1840589
+
+ +

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.

+ +

I really wish the check_linux_raid Nagios plugin for checking Linux +Software RAID in the +nagios-plugins-standard +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.

+ +
+
+ + + Tags: english, raid. + + +
+
+
+ +

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+ + + diff --git a/blog/tags/raid/raid.rss b/blog/tags/raid/raid.rss new file mode 100644 index 0000000000..6caf10c040 --- /dev/null +++ b/blog/tags/raid/raid.rss @@ -0,0 +1,68 @@ + + + + Petter Reinholdtsen - Entries tagged raid + Entries tagged raid + http://people.skolelinux.org/pere/blog/ + + + + How to figure out which RAID disk to replace when it fail + http://people.skolelinux.org/pere/blog/How_to_figure_out_which_RAID_disk_to_replace_when_it_fail.html + http://people.skolelinux.org/pere/blog/How_to_figure_out_which_RAID_disk_to_replace_when_it_fail.html + Tue, 14 Feb 2012 21:25:00 +0100 + <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> + + + + +