You don't say what kind of filesystem /u01 & /u02 are, but if they are EXT file systems, then get their UUUID:
# blkid /dev/cciss/c0d0p3
And then mount the file system based on the UUID with an /etc/fstab entry like:
UUID="abcdef" /u01 ext3 defaults 0 1
This way, it won't matter that the device names will change as LUNs are added or removed. The UUID is an attribute of the filesystem on the LUN, so a different LUN name won't matter in the least.You dont
You cannot simply add disks to increase the storage space of any particular partition unless the device is under LVM control. Instead of LVM however, Oracle recommends to use ASM, which allows you to re-size existing disk groups online by adding new storage devices. Anyway, I'm afraid you are asking for procedures that are too complex to explain here.