Very large capacity LUNs in the 60TB range are created using MetaLUNs. The maximum MetaLUN size supported by the CLARiiON is 16 exabytes. However, as previously mentioned, a 64-bit host O/S is required for large capacity LUNs.
The performance and availabity aspects of MetaLUNs are described in detail in the EMC CLARiiON Best Practices for Performance and Availability, FLARE Revision 29. A higher-level description is found in the EMC CLARiiON Storage System Fundamentals for Performance and Availability. In addition, a very detailed description of MetaLUNs can be found in the EMC CLARiiON MetaLUNs: Concepts, Operations, and Management whitepaper. All these documents are available on PowerLink.