you can de-configure and reconfigure the oracle grid infrastructure home to new mount point
1) stop clusterware and db services
2) copy using tar clusterware and dbhome to new mountpoint.
3) change the mount points (Example: /u01 is source and /u02 is target)
/u01 => /dev/sda1
/u02 => /dev/sdb1
Now mount /dev/sdb1 /u01 and /dev/sda1 on /u02
4) start crs and database services
X A H E E R
Why did you want change mount point? Just curious.