[CentOS] Turning root partition into a RAID array

Peter Farrow peter at farrows.org
Tue Nov 15 15:58:26 UTC 2005

you probably have to boot from the cd using rescue mode as well:

at the cd boot prompt:

linux rescue

this will release the "busy" devices as you can unmount them as you go...


Nigel kendrick wrote:

>I have a CentOS 4.2 system that was set up VERY quickly following the demise
>of its former life as a CentOS 3 server - you don't want the full story, but
>it had to be done quickly to get a company up and working following a slight
>disaster involving an electrician, a portable appliance safety tester and a
>pulled power cable - anyway, here's where I am at...
>Everything is running fine but I now want to mirror the root partition
>(/dev/hda3). I have read quite a few set of notes on the theory but since
>they contain conflicting advice I am hoping someone here can set me straight
>- here's what IO want to do:
>hda3 and hde3 become a mirrored pair (/dev/md0) and this is mounted at boot
>time as /
>Is it as simple as a quick mdadm command and then an edit of /etc/inittab??
>If I try and use mdadm right now I get complaints that /dev/hda3 is busy
>(fair enough) so I guess I need to be in less than 'full steam ahead' mode
>to make the change - over to you....
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>CentOS at centos.org

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