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How you introduce the storage expansion rack into your current storage grid depends on how you want to carve up those disks along with what your current hard disk type is. If you currently have high performance disks on your Exadata, you don't want to mix the high capacity disks into the same diskgroup. In this case, you would want to create a new set of ASM diskgroups for the storage expansion rack (depending on what your storage requirements are).
Exadata storage expansion racks can be introduced to an existing Exadata grid without any downtime. Just add the rack to the IB fabric, create the griddisks, configure the cellip.ora on compute nodes, and create the new diskgroups.
As for the database upgrade, follow either MOS note 1315926.1 for 18.104.22.168 or 1373255.1 for 22.214.171.124. Also, if you're running 126.96.36.199 with OEL 5.3, you're most likely using an Exadata V2, not an X2-2.
Thanks for your reply.
Yes, we have High Performance Disks in our existing environment and we would be creating new ASM diskgroups in expansion rack storage and planning to move old data into expansion rack storage using table's partition movement strategy.
Yes, it is Exadata V2, sorry for typing mistake.
Regarding DB upgrade, we have planned to upgrade it to 188.8.131.52 in next couple of days.