1.1 Channel subsystem (CSS)1.1.1 Multiple channel subsystems1.1.2 Multiple image facility (MIF)1.2 Logical partitions1.3 Subchannel sets1.4 Channels1.4.1 Channel Path ID1.4.2 Physical Channel ID1.4.3 Adapter ID1.4.4 Control unit1.4.5 I/O device1.4.6 Channel path sharing1.4.7 Channel program1.4.8 System Assist Processor1.4.9 Hardware system area (HSA)1.4.10 Fanout card and adapters1.4.11 I/O cage, I/O drawer, PCIe I/O drawer1.4.12 I/O cage domains, slots, and PCHIDs1.4.13 I/O drawer domains, slots, and PCHIDs1.4.14 PCIe drawer domains, slots, and PCHIDs1.5 Defining multiple CSSs and the third subchannel set1.6 Activation1.6.1 Activation procedure1.6.2 Dynamic addition or deletion of a logical partition