On/Off CoD can concurrently add processors (CPs, ICFs, zIIPs, IFLs, and SAPs), increase the model capacity identifier, or both. It can do so up to the limit of the installed processor drawers of a system. It is restricted to twice the installed capacity. On/Off CoD requires a contractual agreement between you and IBM. 

You decide whether to pre-pay or post-pay On/Off CoD. Capacity tokens that are inside the records are used to control activation time and resources. 

GLYPH<SM590000> CBU is a concurrent and temporary activation of more CPs, ICFs, zIIPs, IFLs, and SAPs, an increase of the model capacity identifier, or both. 

CBU cannot  be used for peak workload management in any form. As stated, On/Off CoD is the correct method to use for workload management. A CBU activation$^{2}$ can last up to 90 days when a disaster or recovery situation occurs. 

CBU features are optional, and require unused capacity to be available on installed processor drawers of the backup system. They can be available as unused PUs, an increase in the model capacity identifier, or both. 

The CBU contract provides for one 90-day activation for 1 - 5 years, depending on the customers requirement. For every CBU year ordered, a 10-day CBU test (the CBU test activation ) is part of the CBU contract. In addition, customers can order up to 10 more CBU tests within the same CBU record. 

You can run production workload on a CBU upgrade during a CBU test. At least an equivalent amount of production capacity must be shut down during the CBU test. Terms and conditions are stated in the associated CBU contracts. For more information, contact you IBM representative. 

GLYPH<SM590000> CPE is a concurrent and temporary activation of extra CPs, ICFs, zIIPs, IFLs, and SAPs, an increase of the model capacity identifier, or both. 

The CPE offering is used to replace temporary lost capacity within a client’s enterprise for planned downtime events, such as data center changes. CPE cannot be used for peak load management of client workload or for a disaster situation. 

The CPE feature requires unused capacity to be available on installed processor drawers of the backup system. The capacity must be available as unused PUs, as a possibility to increase the model capacity identifier on a subcapacity system, or as both. 

A CPE contract must be in place before the special code that enables this capability can be loaded on the system. The standard CPE contract provides for one 3-day planned activation at a specific date. For more information, contact your IBM representative. 

