This approach also enables you to update and replenish temporary upgrades, even in  situations where the upgrades are active. Likewise, depending on the configuration,  permanent upgrades can be performed while temporary upgrades are active. Examples of  the activation sequence of multiple temporary upgrades are shown in Figure 8-2.  As shown in Figure 8-2, if R2, R3, and R1 are active at the same time, only parts of R1 can be  activated because not enough resources are available to fulfill all of R1. When R2 is  deactivated, the remaining parts of R1 can be activated as shown. Temporary capacity can be billable as On/Off CoD, or replacement capacity as CBU, CPE, or  System Recovery Boost. Consider the following points: On/Off CoD can be used for client peak workload requirements, for any length of time, and  includes a daily hardware and maintenance charge. The software charges can vary  according to the license agreement for the individual products. For more information,  contact your IBM Software Group representative. 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. Note: CBU cannot be used for peak workload management in any form . Chapter 8. System upgrades  343 GLYPH<SM590000> CBU is a concurrent and temporary activation of more CPs, ICFs, zIIPs, IFLs, and SAPs;  or an increase of the model capacity identifier; or both.  GLYPH<SM590000> On/Off CoD is a function that enables  concurrent  and  temporary  capacity growth of the  system.  Figure 8-2 Example of temporary upgrade activation sequence Time R2 R2 R4 R2 R4 R3 R2 R3 R1 R4 R2 R3 R1 R2 R3 R3 R1 Record and associated authorization Activation and usage of dormant resources over time CPE OOCoD CBU CBU OOCoD OOCoD OOCoD OOCoD OOCoD CPE CPE CBU CBU CBU CBU CBU CBU