[CentOS] Turning root partition into a RAID array

Chris Mauritz chrism at imntv.com
Tue Nov 15 17:55:21 UTC 2005

That's the ticket.   I wonder if anyone has tried building a "rescue USB 
thumb drive" since the 1GB devices are so cheap these days.  That would 
be great for this kind of situation.


Peter Farrow wrote:

> 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...
> P.
> 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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