This post is about upgrades. The first thing I like to mention is the availability of 220.127.116.11 for the Oracle Exadata Database Machine since today (Jan 3rd 2012). With this, it is now possible to upgrade your Oracle Exadata Database Machine to 18.104.22.168. To help you best with the upgrade we have released a MOS note that describes the prerequisites and steps to go from 22.214.171.124 or 126.96.36.199 installations to 188.8.131.52. Please see the MOS note for the best approach on how to apply this upgrade in your environment. The MOS note applies to both Solaris 11 Express and Linux installations and upgrades both the Grid Infrastructure and the Database Home on V2, X2-2 and X2-8.
Please see MOS note "184.108.40.206/220.127.116.11 to 18.104.22.168 Database Upgrade on Exadata Database Machine" (Doc ID 1373255.1) for more details.
For V1 users we have recently also published MOS note 888834.1. This document contains the steps to upgrade the HP Oracle Database Machine to Oracle Exadata Storage Server Software 11.2.X. The steps include upgrading Oracle Cluster Ready Services (CRS) 22.214.171.124.X and Oracle Automatic Storage Management (ASM) 126.96.36.199.X to Oracle Grid Infrastucture 188.8.131.52 and Oracle RDBMS from 184.108.40.206 to Oracle RDBMS 220.127.116.11. After upgrading to 11.2.0 on V1 hardware using MOS note 888834.1, MOS note 1373255.1 can be used to upgrade to 18.104.22.168.
Please See MOS note "HP Oracle Database Machine 11.2 Upgrade" (Doc ID 888834.1)