zIIPs are configured via the normal PR/SM™ logical
partition image profile.
You can define a logical partition to use one or more zIIPs and/or
zAAPs with either of the following combinations:
- One or more dedicated general purpose CPs and one or more dedicated
zIIPs/zAAPs
- One or more shared general purpose CPs and one or more shared
zIIPs/zAAPs
The mode specified for the logical partition must be set to ESA/390
to allow for the definition of zIIPs or zAAPs to the logical partition.
Futhermore, there are the following requirements regarding zIIPs
and standard CPs:
- The number of zIIPs must not exceed the number of standard CPs
on a server.
- You must have at least one standard CP defined for a partition.
The z/OS® system needs at least
one standard CP online at all times.
- You can set the number of zIIPs for an LPAR, and each processor
pool (for example, CPs and zIIPs) can be assigned a unique weight
when the processors are being shared.
- There is hard capping for zIIPs, but there is no support of defined
capacity (which is the WLM support for 4-hour rolling average). The
existing single set of PR/SM logical
partition processor weights (INITIAL, MIN, MAX) are applied independently
to the shared standard CPs — capping only applies to shared
standard CPs configured to the logical partition. If you use WLM
weight management for the LPAR with SCRT, then z/OS WLM manages shared standard CPs as today,
but not the zIIPs.
- zIIPs do not participate in Intelligent Resource Director. zIIPs
do not participate in dynamic share management or in the number of
logical zIIPs online.
Note that zIIPs are brought online and offline like standard CPs.
Combining zIIP-enabled sysplex members with non-zIIP enabled sysplex
members is supported.