IBM Z9, Planning Manual

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Dynamic Capacity Upgrade on Demand Limitations
1. Valid upgrade towers are as follows starting at the smallest model in the
pathway:
z9 EC Models
S08, S18, S28, S38, S54
z9 BC Models
R07, S07
Inactive (spare) PUs can be added concurrently, dynamically providing
nondisruptive upgrade of processing capability. They can be characterized, in
any combination, as CPs, ICFs IFLs, IFAs, or zIIPs. Neither the number of
zAAPs nor zIIPs can exceed the number of CPs.
2. For shared CP PR/SM configurations, added CPs are brought into the pool of
shared CPs, effectively increasing the number of physical CPs to be shared
amongst partitions. To increase the number of logical CPs online to an LP,
simply define the LP with both initial and reserved logical CPs. Then all you
need to do is configure on the extra logical CP(s) after the concurrent upgrade.
3. All models have the ability to define logical partitions with as many reserved
CPs as necessary. With thoughtful planning, there is never a need for a
disruptive increase in the number of logical CPs
4. The maximum initially online logical CP width that logical partitions can be
defined and activated with at any point in time is as follows (the maximum
defined logical CP width is as great as the total number of CPs achievable via
concurrent CPU upgrade):
v
Maximum initial logical CPs defined for a dedicated partition equals physical
CPs online for the current model minus physical CPs currently dedicated and
online to other dedicated partitions minus the maximum online number of
shared CPs among all the activated logical partitions that are using shared
CPs.
v
Maximum initially online logical CPs defined for a shared partition equals
physical CPs online for the current model minus physical CPs currently
dedicated and online to other partitions using dedicated CPs.
v Maximum total logical CPs (including initial and reserved) for any partition
equals the number of physical CPs achievable through concurrent CP
upgrade.
v
When a logical partition is defined to use ICFs, IFLs, zIIPs or IFAs, these
rules are applied against the installed processors of that type. In the case of
IFAs and zIIPs, logical partitions can have a combination of general purpose
processors and IFAs/zIIPs defined. These rules apply to each processor type
defined to the partition independently. The total number of all logical
processors defined to the logical partition cannot exceed the maximum
supported for a logical partition by the CEC (32), independent of processor
type.
Chapter 2. Planning Considerations
2-65