Environment Variables that Create Logical Partitions 3-3
You define values for one environment variable to define the number of logical
partitions on your system, one to set the memory mode, and two for each
partition that define the CPU and I/O modules in each partition. The lpinit
command (described in context in Chapter 4) initializes the logical partitions
defined. Figure 3–1 and Table 3–1 give an overview of the environment
variables and what they do. Environment variable settings for the CPU and I/O
masks are discussed in detail in following sections of this chapter. (Memory
allocation is discussed in detail in Section 2.4.)
Table 3–1 Environment Variables for Logical Partitions
Environment
Variable
Definition
lp_count n
The number of logical partitions you wish to create on the
system. At the start of creating logical partitions, you set
this value to 0. Later, as described in Chapter 4, you define
the number of logical partitions desired. 0 indicates the
traditional symmetric multiprocessing system. Possible
values are 0 (partitions disabled), 2 (for two partitions), or 3
(for three partitions).
lp_cpu_mask* x
For the *, you supply the number of the partition, which
may be 0, 1, or 2. The value x gives a binary mask
indicating which CPUs you want included as part of the
instance. Although the mask selects individual CPUs,
assignments must align with module boundaries. See
Section 3.2 for detailed examples.
lp_io_mask* x
For the *, you supply the number of the partition, which
may be 0, 1, or 2. The value x gives a binary mask
indicating the slot number of the I/O module or modules to
be reserved for the use of a particular instance. Detailed
examples are given in Section 3.3.
lp_mem_mode x
The value of x must be isolate.
