I/O Subsystem And I/O Features - IBM z13s Technical Manual

workload runs on a zIIP processor, thus reducing the complexity of the IBM z/Architecture®.
zAAPs are no longer supported beginning with the z13 and z13s servers.
Workload variability
Consult the LSPR when considering performance on z13s servers. Individual logical
partitions (LPARs) have more performance variability of when an increased number of
partitions and more PUs are available. For more information, see Chapter 12, "Performance"
on page 437.
For detailed performance information, see the LSPR website at:
https://www.ibm.com/servers/resourcelink/lib03060.nsf/pages/lsprindex
The millions of service units (MSUs) ratings are available from the following website:
http://www.ibm.com/systems/z/resources/swprice/reference/exhibits/
Capacity on demand (CoD)
CoD enhancements enable clients to have more flexibility in managing and administering
their temporary capacity requirements. z13s servers support the same architectural approach
for CoD offerings as the zBC12 (temporary or permanent). Within z13s servers, one or more
flexible configuration definitions can be available to solve multiple temporary situations and
multiple capacity configurations can be active simultaneously.
The customer can stage records to prepare for many scenarios. Up to eight of these records
can be installed on the server at any time. After the records are installed, the activation of the
records can be done manually, or the z/OS Capacity Provisioning Manager can automatically
start the activation when Workload Manager (WLM) policy thresholds are reached. Tokens
are available that can be purchased for On/Off CoD either before or after workload execution
(pre- or post-paid).
LPAR group absolute capping
IBM PR/SM™ and the Hardware Management tool have been enhanced to limit the amount
of physical processor capacity that is consumed by a group of LPARs when a processor unit
is defined as a general-purpose processor or as an IFL shared across a set of LPARs.
Currently, a user can define the LPAR group capacity limits that allow one or more groups of
LPARs to each have their own capacity limit. This new feature adds the ability to define an
absolute capping value for an entire LPAR group. This group physical capacity limit is
enforced as an absolute limit, so it is not affected by changes to the logical or physical
configuration of the system.

1.2.3 I/O subsystem and I/O features

The z13s servers support both PCIe and InfiniBand I/O infrastructure. PCIe Gen3 features
are installed in PCIe I/O drawers. Up to two PCIe I/O drawers per z13s server are supported,
providing space for up to 64 PCIe features. When upgrading a zBC12 or a z114 to a z13s
server, one I/O drawer is also supported as carry forward. I/O drawers were introduced with
the IBM z10™ BC.
The z13s Model N20 single CPC drawer can have up to eight PCIe and four InfiniBand (IFB)
fanouts, a Model N20 with two CPC drawers has up to 16 PCIe and eight IFB fanouts,
whereas the N10 can have up to four PCIe and two IFB fanouts used for the I/O infrastructure
and coupling.
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Chapter 1. Introducing IBM z13s servers