X-Git-Url: http://pere.pagekite.me/gitweb/homepage.git/blobdiff_plain/9874ebb15b7a85d0d6e59d17eb4a66c9cb704948..37f0de1062c404482eed7c8f26decb52666dbc41:/blog/archive/2012/02/02.rss diff --git a/blog/archive/2012/02/02.rss b/blog/archive/2012/02/02.rss index 50ea277d31..df48fca068 100644 --- a/blog/archive/2012/02/02.rss +++ b/blog/archive/2012/02/02.rss @@ -250,11 +250,69 @@ first place. In Debian Edu, the proxy setup is updated using dhcp and 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> + + + + + 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>