Physical and logical systems

Physical systems

A physical system is a complex of processors and associated memory. It also includes the communications channels and other resources used to run a single operating system image in non-partitioned mode or multiple operating system images in partitioned mode (for example, using PR/SM, MDF, or MLPF).

UIE assigns a unique name to each physical system, using the following format:

nnnn represents the last four digits of the CPU serial number.

Using the hardware table, UIE can also detect the CPU type (3090-600J, 9121-RX5, and so on) and determine the MIPS rating of the physical system. However, some of the information that UIE uses to determine the CPU type is not always sufficient and with over 1000 CPUs available and it may sometimes be impossible to detect the correct CPU type.

For this reason, you might want to override the detected CPU type and MIPS rating. You might also prefer to give the physical system a more meaningful name than PSYSnnnn. You can override the default PSYSnnnn name, the detected CPU type and MIPS rating for any group of z/OS images that you are processing using the PSYS command in the Commands panels. See PSYS for details on the PSYS command.

Logical systems

A logical system is a copy of a z/OS system running on one of the physical systems. A logical system is defined by its System ID (SID).