Pu Characterization; Pu Core Floorplan - IBM z13s Technical Manual

Recovery unit (RU): The RU keeps a copy of the complete state of the system that
includes all registers, collects hardware fault signals, and manages the hardware recovery
actions.
Dedicated Coprocessor (COP): The dedicated coprocessor is responsible for data
compression and encryption functions for each core.
XU
Figure 2-14 PU Core floorplan

2.3.4 PU characterization

In each CPC drawer, PUs can be characterized for client use. The characterized PUs can be
used in general to run supported operating systems, such as z/OS, z/VM, and Linux on
z Systems. They can also run specific workloads, such as Java, XML services, IPSec, and
some DB2 workloads, or functions such as Coupling Facility Control Code (CFCC). For more
information about PU characterization, see 3.5, "Processor unit functions" on page 100.
The maximum number of characterized PUs depends on the z13s model. Some PUs are
characterized by the system as standard system assist processors (SAPs) to run the I/O
processing. By default, there are at least two spare PUs per Model N20 system that are used
to assume the function of a failed PU. The remaining installed PUs can be characterized for
client use. The Model N10 uses unassigned PUs as spares when available. A z13s model
nomenclature includes a number that represents the maximum number of PUs that can be
characterized for client use, as shown in Table 2-3.
Table 2-3 Number of PUs per z13s model
Model
N10
N20
N20
50
IBM z13s Technical Guide
LSU
ICM
L2I
CPC PUs IFLs
Drawers uIFLs
/ PUs
1 / 13 0-6 0-10
1 / 26 0-6 0-20
2 / 26 0-6 0-20
RU
PC
L2D
zIIPs ICFs Standard
SAPs
0-6 0-10 2
0-12 0-20 3
0-12 0-20 3
Optional Standard IFP
SAPs Spares
0-2 0
0-3 2
0-3 2
1
1
1