PR/SM Feature

When the processor resource/system manager (PR/SM) feature is used to create logical partitions on a central processor complex (CPC) a unique logical CPUID is created for each logical partition by creating a new and unique CPU identification number (all other fields are unchanged).

The CPU identification number is a six-digit number as follows:

asnnnn

a: Logical processor address
s: PR/SM logical partition identifier or second digit of the machine serial number
nnnn: Represents the last four digits of the machine serial number

The logical processor address is a function of the CPC model, whether the CPC is a single image or physically partitioned and how many logical processors are assigned to the partition.

The PR/SM logical partition identifier is the same hexadecimal digit used to identify the partition when it was initially defined (in the IOCDS).

The PR/SM logical partition identifier must be used in conjunction with the last four digits of the machine serial number, whenever using the CPU serial number in a parameter or control statement.