Processors - IBM z13s Technical Manual

8.8.1 Processors

CPs, ICFs, zIIPs, IFLs, and SAPs can be concurrently added to a z13s server if unassigned
PUs are available in any installed CPC drawer. The number of zIIPs cannot exceed twice the
number of CPs, plus unassigned CPs. If necessary, more LPARs can be created concurrently
to use the newly added processors.
The coupling facility control code (CFCC) can also configure more processors online to CF
LPARs by using the CFCC image operations window.
8.8.2 Memory
Memory can be concurrently added up to the physically installed memory limit.
Using the previously defined reserved memory, z/OS OS images and z/VM partitions can
dynamically configure more memory online, enabling nondisruptive memory upgrades. Linux
on z Systems supports Dynamic Storage Reconfiguration.
8.8.3 I/O
I/O adapters can be added concurrently if all of the required infrastructure (I/O slots and
fanouts) is present on the configuration.
Dynamic I/O configurations are supported by certain OSs (z/OS and z/VM), enabling
nondisruptive I/O upgrades. However, having dynamic I/O reconfiguration on a stand-alone
CF server is not possible because there is no OS with this capability running on this server.
8.8.4 Cryptographic adapters
Crypto Express5S features can be added concurrently if all of the required infrastructure is in
the configuration.
8.8.5 Special features
Special features, such as Flash Express, IBM zEnterprise Data Compression (zEDC), and
Remote Direct Memory Access (RDMA) over Converged Ethernet (RoCE), can also be
added concurrently if all of the infrastructure is available in the configuration.
8.8.6 Concurrent upgrade considerations
By using MES upgrade, On/Off CoD, CBU, or CPE, a z13s server can be concurrently
upgraded from one capacity identifier to another, either temporarily or permanently.
Enabling and using the additional processor capacity is transparent to most applications.
However, certain programs depend on processor model-related information (for example, ISV
products). You need to consider the effect on the software that is running on a z13s server
when you perform any of these configuration upgrades.
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IBM z13s Technical Guide