Raid 4 resize, raid0 limit question

Hello, list,

I plan to resize (grow) one raid4 array.

1. stop the array.
2. resize the partition on all disks to fit the maximum size.

After this restart(assemble) the array is possiple?
I mean, how can the kernel find the superblock fits on the half of the new
partitions?
I need to recreate the array instead of using -G option?
Can i force raid to resync only the new area?

The raid0 in 2.6.16-rc1 supports 4x 3.6TB soure devices? :-)

Thanks,
Janos