Processor Characteristics

Table 1 shows all logical partitions, required characterized PUs, and operating systems, and which PU characterizations can be configured to a logical partition image. The available combinations of dedicated (DED) and shared (SHR) processors are also shown. For all combinations, a logical partition can also have reserved processors defined, allowing nondisruptive logical partition upgrades.
Table 1. LP mode and PU usage
Logical partition mode PU type Operating systems PUs usage
General CPs z/Architecture operating systems CPs DED or CPs SHR
CPs or zIIPs z/OS CPs DED and optionally zIIPs DED or CPs SHR and optionally zIIPs SHR
General CPs z/TPF CPs DED or CPs SHR
CPs 21CS VSEn® CPs DED or CPs SHR
Coupling facility ICFs or CPs CFCC ICFs DED or ICFs SHR, or CPs SHR
Linux® only IFLs or CPs Linux z/VM IFLs DED or IFLs SHR, or CPs DED or CPs SHR
z/VM® CPs, IFLs, zIIPs ICFs z/VM All PUs must be either SHR or DED
SSC CPs, IFLs SSC IFLs DED or IFLs SHR, or CPs DED or CPs SHR