IBM 990 - Manual (Page 223)

Chapter 8. Capacity upgrades 211
Memory
Memory can be concurrently added to a z990 server up to the physical installed memory limit.
Additional book(s) can also be installed concurrently, allowing further memory upgrades by
LIC-CC enabling memory capacity on the new book(s).
Using the previously defined reserved memory, z/OS and OS/390 operating system images
can dynamically configure more memory online, allowing nondisruptive memory upgrades.
I/O
I/O cards can be added concurrently to a z990 server if all the required infrastructure (I/O
slots and STIs) is present on the configuration. The Plan Ahead process can assure that an
initial configuration will have all the infrastructure required for the target configuration.
Also I/O ports can be concurrently added by LIC-CC, enabling available ports on ESCON and
ISC-3 Daughter Cards.
Dynamic I/O configurations are supported by some operating systems (z/OS, OS/390, and
z/VM), allowing nondisruptive I/O upgrades. However, it is not possible to have dynamic I/O
reconfigurations on an stand-alone Coupling Facility server, because there is no operating
system with this capability running on this server. Dynamic I/O configurations require
additional space in the HSA for expansion.
PCI Cryptographic coprocessors
PCI cryptographic (PCIXCC and PCICA) cards can be added concurrently to a z990 server if
all the required infrastructure, I/O slots and STIs, is present on the configuration. The Plan
Ahead process can assure that an initial configuration will have all the infrastructure required
by the target configuration.
In order to make the addition of PCIXCC and/or PCICA cards nondisruptive, logical partitions
must be predefined with the appropriate PCI cryptographic processor number selected in its
candidate list on the partition image profile. To maximize concurrent upgrade possibilities in
this area, it is recommended that all logical partitions define all possible PCI cryptographic
coprocessors as candidates for the logical partition. This is possible even if there are no PCI
cryptographic coprocessors currently installed on the machine.
8.6.1 Upgrade scenarios
The following scenarios are examples of nondisruptive upgrades, showing the hardware
(z990 server) upgrades and the image (logical partitions) upgrades. Only the images
previously configured with Reserved Processors and/or Reserved Memory can be
nondisruptively upgraded. Spare PUs are used for hardware upgrades and “spare logical
processors” (Reserved Processors) are used for image upgrades.
All scenarios show the hardware (physical) and the logical partition configurations before and
after the upgrade. Only the eight PUs available for CPs, IFLs, ICFs, and zAAPs are shown on
each server’s book.
Shared logical partitions upgrade
Figure 8-11 shows a 2084-A08 software model 307 server. This one-book server
configuration has seven CPs and one spare PU.
Tip: Configure as many as possible reserved CPs, IFLs, ICFs, zAAPs, and memory to a
logical partition to allow concurrent image upgrades.