/home too small

["Andrea" <anpavin@tiscali.it>]

Hi, I've installed QMR on a debian server. When I partitioned my disks
I reserved a lot of space to /var and only 10 Gb to /home. Now I
discover that all the messages are in /home/vpopmail/...
Now I wish to resize partition reserving a lot of space to /home.
I think it's impossible resize partition because I've 2 HD in raid 1
made with Debian's RAID configuration.
Have you an idea ? It is possible to change the setting in order that
messages dir became /var/...

Thank you