The use of the capacity provisioning function requires the following prerequisites: 

GLYPH<SM590000> TCP/IP connectivity to observed systems 

GLYPH<SM590000> RMF Distributed Data Server must be active 

GLYPH<SM590000> CIM server must be active 

GLYPH<SM590000> Security and CIM customization 

GLYPH<SM590000> Capacity Provisioning Manager customization. 

In addition, the Capacity Provisioning Control Center must be downloaded from the host and installed on a PC server. This application is used only to define policies. It is not required for regular operation. 

Customizing the capacity provisioning function is required on the following systems: 

GLYPH<SM590000> Observed z/OS systems 

These systems are in one or multiple sysplexes that are to be monitored. For more information about the capacity provisioning domain, see 8.8, “Nondisruptive upgrades” on page 320. 

GLYPH<SM590000> Runtime systems 

These systems are where the Capacity Provisioning Manager is running, or to which the server can fail over after server or system failures. 

## 8.5.3 Ordering 

Concurrently installing temporary capacity by ordering On/Off CoD is possible in the following manner: 

GLYPH<SM590000> CP features equal to the MSU capacity of installed CPs 

GLYPH<SM590000> IFL features up to the number of installed IFLs 

GLYPH<SM590000> ICF features up to the number of installed ICFs 

GLYPH<SM590000> zIIP features up to the number of installed zIIPs 

GLYPH<SM590000> SAPs up to two for all CPC drawer capacities 

On/Off CoD can provide CP temporary capacity in the following ways: 

GLYPH<SM590000> By increasing the number of CPs. 

GLYPH<SM590000> For subcapacity models, capacity can be added by increasing the number of CPs, changing the capacity setting of the CPs, or both. The capacity setting for all CPs must be the same. If the On/Off CoD is adding CP resources that have a capacity setting different from the installed CPs, the base capacity settings are changed to match. 

On/Off CoD includes the following limits that are associated with its use: 

– The number of CPs cannot be reduced. 

– The target configuration capacity is limited to the following amounts: 

GLYPH<129> Twice the currently installed capacity, expressed in MSUs for CPs. 

GLYPH<129> Twice the number of installe d IFLs, ICFs, and zIIPs (the number of extra SAPs that can be activated is two). For more information, see 8.2.1, “Upgrades” on page 288. 

On/Off CoD can be ordered as prepaid or postpaid. A prepaid On/Off CoD offering record contains resource descriptions, MSUs, several speciality engines, and tokens that describe the total capacity that can be used. For CP capacity, the token contains MSU-days. For speciality engines, the token contains speciality engine-days. 

