raid question

[Rudy Gevaert <rudy@zeus.UGent.be>]

Hello,

I was wondering can I set up raid when a partition is mounted?
e.g.  hda3 is /home and I want to set up raid1 with hdc3.  

Can I run mkraid when hda3 is in use?  I would use the following
raidtab:

raiddev /dev/md0
        raid-level      1
        nr-raid-disks   2
        nr-spare-disks  0
        chunk-size      4
        persistent-superblock 0
        device          /dev/hda3
        raid-disk       0
        device          /dev/hdc3
        raid-disk       1

Also, would I lose data?  When happens if I change the above order?

Thanks in advance,



-- 
Rudy Gevaert                rudy@zeus.UGent.be
Web page                    http://www.webworm.org
GNU/Linux user and Savannah hacker http://savannah.gnu.org
It is better to have a permanent income than to be fascinating. 
                                  - Oscar Wilde (1854-1900)