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Overview
This chapter introduces the characteristics of logical partitioning and migration and
compatibility considerations. Processor Resource/Systems Manager
standard on all z9 EC and z9 BC models.
Prerequisites for Operation
The prerequisites for operation are:
v Programming compatibility
v Hardware support
v Operator training
v Programming support
PR/SM
PR/SM enables logical partitioning of the central processor complex (CPC).
Logical Partitioning
PR/SM enables the logical partitioning function of the CPC. The operator defines
the resources that are to be allocated to each logical partition (LP). Most resources
can be reconfigured without requiring a power-on reset. After an ESA/390, ESA/390
TPF, or Linux
program into that LP. If a coupling facility logical partition is defined and activated,
the coupling facility control code is automatically loaded into the LP.
Central Storage
Central storage is defined to LPs before LP activation. When an LP is activated, the
storage resources are allocated in contiguous blocks. These allocations can be
dynamically reconfigured. Sharing of allocated central storage among multiple LPs
is not allowed.
On System z9, all storage is defined as central storage. Allocation of storage to
logical partitions can be made as either central storage or expanded storage. Any
allocation of expanded storage to an LP reduces the amount of storage available
for allocation as central storage. See "Single Storage Pool" on page 3-7. If no
storage is allocated as expanded storage and no other LP is currently active, an
individual LP can have a central storage amount equal to installed storage minus
the size of the hardware system area (HSA). The sum total of all LP central and
expanded storage cannot exceed the amount of installed storage - HSA. Storage
allocated to LPs never includes HSA. Central storage in excess of 2 GB should only
be allocated in an LP that has an operating system capable of utilizing the new
64-bit z/Architecture.
Expanded Storage
Optional expanded storage is defined to LPs before LP activation. When an LP is
activated, the storage resources are allocated in contiguous blocks. These
allocations can be dynamically reconfigured. Sharing of allocated expanded storage
among multiple LPs is not allowed.
See "Expanded Storage" on page 3-10.
1-2
PR/SM Planning Guide
– Control program support
– Input/Output Configuration Program (IOCP) support
®
-Only LP is defined and activated, you can load a supported control
™
(PR/SM) is
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