Logical Partitions; Characteristics - IBM Z9 Planning Manual

Logical Partitions

Characteristics

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v Deactivating an LP
This section provides an overview of LP characteristics. Some of the characteristics
described in this section are model-dependent, EC-level dependent,
MCL-dependent, LP mode dependent, or control-program dependent. For this
reason, all of the characteristics described here are not necessarily available on all
CPCs.
The resources of a CPC can be distributed among multiple control programs that
can run on the same CPC simultaneously. Each control program has the use of
resources defined to the logical partition in which it runs.
You can define an LP to include:
v One or more CPs
v Central storage
v Channel paths
v Optional expanded storage
v Two or more optional Crypto Express2 Coprocessors or Crypto Express2
Accelerators
An LP can be defined to include CPs, zAAPs, and zIIPs (in combination, so long as
one CP is defined) or IFLs.
You can also define an LP to be a coupling facility running the coupling facility
control code.
LPs can have the following characteristics. For more information or details about
exceptions to any of the characteristics described below, see "Determining the
Characteristics" on page 3-5).
v The maximum number of LPs you can define on a z9 EC is 60. The z9 BC S07
supports 30 LPs. The BC R07 only supports the activation of 15 LPs but you can
power-on reset the R07 with an IOCDS containing up to 30 LPs. You cannot
define an IOCDS with more than 30 LPs for a z9 BC.
v LPs can operate in ESA/390, ESA/390 TPF, Linux-Only, or coupling facility mode.
v The storage for each LP is isolated. Central storage and expanded storage
cannot be shared by LPs.
v Using dynamic storage reconfiguration, an LP can release storage or attach
storage to its configuration that is released by another LP.
v All channel paths can be defined as reconfigurable. Channel paths are assigned
to LPs. You can move reconfigurable channel paths between LPs using tasks
available from either the Hardware Management Console or the support element
console. If the control program running in the LP supports physical channel path
reconfiguration, channel paths can be moved among LPs by control program
commands without disruption to the activity of the control program.
v MIF allows channel paths to be shared by two or more LPs at the same time.
Only CNC, CTC, CBP, CIB, CFP, ICP, OSC, OSD, OSE, OSN, FC, FCV, FCP,
and IQD channel paths can be shared.
v LPs can be defined to have as many as 54 logical CPs. CPs can be dedicated to
LPs or shared by them. CPs that you define as dedicated to an LP are not
available to perform work for other active LPs. The resources of shared CPs are
allocated to active LPs as needed. You can cap (limit) CP resources, if required.
Chapter 1. Introduction to Logical Partitions
1-15