In the Perform Model Conversion window, select  Permanent upgrades  to start the process,  as shown in Figure 8-8. The window provides several possible options. If you select the  Retrieve and apply  data  option, you are prompted to enter the order activation number to start the permanent  upgrade, as shown in Figure 8-9.  On/Off CoD allows you to temporarily enable PUs and unassigned IFLs that are available  within the current hardware model. You can also use it to change capacity settings for CPs to  help meet your peak workload requirements.  The capacity for CPs is expressed in millions of service units (MSUs). Capacity for speciality  engines is expressed in number of speciality engines.  Capacity tokens  are used to limit the  resource consumption for all types of processor capacity. 8.5 On/Off Capacity on Demand 8.5.1 Overview Figure 8-8 z15  Perform Model Conversion window Figure 8-9 Customer Initiated Upgrade Order Activation Number window Chapter 8. System upgrades  355