Installation guide

Configuration
Rules
2-9
Logical partitions are divided on hardware module boundaries. For example,
each CPU module contains two CPUs, but you cannot have one CPU in one par-
tition, and the other CPU in another. Both CPUs on a module must be in the
same partition.
Each partition must have at least one CPU module, one memory module, and
one KFTIA or KFTHA I/O module. The combined partitions may include up to
nine modules (the limit of the TLSB card cage).
•
CPU modules are installed beginning in slot 0 and proceed upward by slot
number.
•
I/O modules are installed beginning in slot 8 and proceed downward, to a
limit of three I/O modules.
•
Memory modules are installed beginning in the next-highest slot above the
CPU module(s) and proceed upward until all modules are installed, up to
slot 5 or 6 (depending on whether three or two I/O modules are installed, re-
spectively).
Note that in a three-partition system, there can only be three CPU modules,
three memory modules, and three I/O modules, since partitions allocate whole
modules and the total number of slots available is 9. The memory modules can
be of various sizes; disable interleaving for any configuration (set interleave
none). Figure 2-4 shows the allowed configuration for modules in the TLSB
card cage.
Allocating Modules to Partitions
Chapter 3 tells how you set console firmware environment variables to define
which CPU and I/O modules are contained in any particular logical partition.
You can allocate CPU modules and I/O modules to partitions in any config-
uration you desire, as long as each partition has at least one I/O module and one
CPU module.
You specify memory mode for partitioning as isolate, which tells the console
firmware to distribute memory modules between partitions at module bounda-
ries. This is described in more detail in the next section.