How to convert raid0 to raid1

I have a system running RedHat linux 7.2 and i have
configured RAID 1 for my / and /boot partitions during
installation. However, for my /var partition, i had
mistakenly chosen RAID 0. The two members are of
exactly same size and are on 2 seperate disks. Now i
want to change it to RAID 1. Please suggest the
correct procedure to do it.
I changed the /etc/raidtab and did a reboot, but it
didnt work. raidhotremove cant be used either as /var
cant be unmounted.
How should i proceed? Someone please help.
Bhamini


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