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. 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. 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. 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.  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.  2 z14 ZR1 servers provide more improvements in the CBU activation windows. These windows were improved to  prevent inadvertent CBU activation. Chapter 8. System upgrades  293