A hardware configuration upgrade always requires more physical hardware (PU SCMs, PCIe+ I/O drawers, or both). A system upgrade can change either (or both) of the system model and the MCI. 

Consider the following points regarding upgrades: 

GLYPH<SM590000> LICCC upgrade: 

– Can add memory or Virtual Flash Memory (VFM) up to the amount physically installed 

– Can change the model capacity identifier, the capacity setting, or both 

GLYPH<SM590000> Hardware installation upgrade: 

– Can change the CPC drawer feature by adding one or more PU SCMs 

– Can change the model capacity identifier, the capacity setting, or both 

– Can add physical memory, PCIe+ I/O drawers, and other hardware features 

The model capacity identifier can be concurrently changed. Concurrent upgrades can be performed for permanent and temporary upgrades. 

CPC drawer feature upgrades:  All upgrades from a CPC feature to another CPC feature are disruptive because the extra PU SCMs must be physically installed or changed (for example, upgrade from Max24 to Max30). 

## Licensed Internal Code upgrades (MES ordered) 

The LICCC provides for system upgrades without hardware changes by activating extra (previously installed) unused capacity. Concurrent upgrades through LICCC can be performed for the following resources: 

GLYPH<SM590000> Processors, such as CPs, ICFs, IBM z Integrated Information Processors (zIIPs), IFLs, and SAPs, if unused PUs are available in the CPC drawer, or if the model capacity identifier for the CPs can be increased. 

GLYPH<SM590000> Memory and VFM, when unused capacity is available on the installed memory cards. Plan-ahead memory is available to give you better control over future memory upgrades. For more information, see 2.5.6, “Preplanned memory” on page 45. 

## Concurrent hardware installation upgrades (MES ordered) 

Configuration upgrades can be concurrent when installing the following resources: 

GLYPH<SM590000> ICA SR or PCIe fanout cards 

GLYPH<SM590000> I/O cards, when slots are available on the installed PCIe+ I/O drawers 

GLYPH<SM590000> PCIe+ I/O drawers, when fanout slots are available in the CPC drawer 

The concurrent I/O upgrade capability can be better used if a future target configuration is considered during the initial configuration. 

## Concurrent PU conversions (MES ordered) 

z14 ZR1 servers support concurrent conversion between all PU types, which includes SAPs, to provide flexibility to meet changing business requirements. 

Important:  The LICCC-based PU conversions require that at least one PU (CP, ICF, or IFL), remains unchanged. Otherwise, the conversion is disruptive. The PU conversion generates an LICCC that can be installed concurrently in two steps: 

1. Remove the assigned PU from the configuration. 

2. Activate the newly available PU as the new PU type. 

