The problem you might have is that you intend to boot /root1 then move everything into /root1 while the system is running out of that partition.
You'll probably be OK, but not certainly.
I think if I were you that I would identify exactly where in the system your raid driver was installed, and I would then make sure that I had a copy of that driver tucked away, and anything in /etc/modules, or /etc/modules.conf or /etc/conf.modules (depending on distro) tucked away safely also. Then, after doing my copy and before rebooting, I'd check all the relevant files to make sure they were there and they were right.
If, after copying, the system didn't work (which could happen), I'd have a Linux Live CD sitting ready, and I'd boot into that to make the checks of the filesystem, then I'd boot into it.