[CentOS] Mirror After?

[Robert]

ML wrote:
> Hi All,
>
> If I put a 1TB HD in my server (because they are on sale this week),  
> can I later Mirror to a second 1TB drive without destroying the data  
> on the first?
>
> On Windows and OS X, I know I can't do this...
>
> Thoughts?
>
> -ML
>   

Step by step instructions at 
http://www.howtoforge.com/software-raid1-grub-boot-fedora-8

BUT be sure you have an up-to-date backup in case it clabbers.