IBM 990 - Manual (Page 205)

Chapter 8. Capacity upgrades 193
upgrades. The operating system must have the capability to concurrently configure more
processors online.
Software charges based on the total capacity of the server on which the software is installed
would be adjusted to the maximum capacity after the CUoD upgrade. Refer to Table 6-3 on
page 148 to check software implications for CUoD.
Software products using Workload License Charge (WLC) may not be affected by the server
upgrade, as their charges are based on partition utilization and not based on the server total
capacity. Refer to 6.8, “Workload License Charges” on page 150 for more information about
WLC.
CUoD for memory
CUoD for memory can add, concurrently, more memory to a z990 server by enabling, via
LIC-CC, additional capacity up to the limit of the current installed memory cards, and/or by
installing concurrently additional book(s) and LIC-CC enabling memory capacity on the new
book(s).
The memory card sizes on the z990 are 8, 16, or 32 GB, and each book has two memory
cards with the same physical storage capacity.
Table 2-1 on page 28 lists the range of system memory associated with a given memory card
size and the number of memory cards for each server model. Figure 8-2 on page 194 shows
an example of CUoD for memory of a 2084-A08 server with 24 GB of available memory.
Attention: Up to 32 logical processors, including reserved processors, can be defined to a
logical partition. z/OS 1.6 is planned to support up to 24 processors, as a combination of
CPs and zAAPs. z/VM 5.1 is planned to support up to 24 processors, which can be either
all CPs or all IFLs.
Note: Upgrades requiring memory card changes on any installed book are disruptive.