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## 8.1.3 Concurrent and nondisruptive upgrades 

Depending on the effect on the system and application availability, upgrades can be classified in the following manner: 

GLYPH<SM590000> Concurrent 

In general, concurrency  addresses the continuity of operations of the hardware  during an upgrade; for example, whether a system (hardware) must be turned off during the upgrade. For more information, see 8.2, “Concurrent upgrades” on page 338. 

GLYPH<SM590000> Non-concurrent 

This type of upgrade requires turning off the hardware that is being upgraded. Examples include memory upgrades to a z15 T01 max 34. 

GLYPH<SM590000> Nondisruptive 

Nondisruptive  upgrades do not require the software or operating system to be restarted for the upgrade to take effect. 

GLYPH<SM590000> Disruptive 

An upgrade is considered disruptive  when resources that are modified or added to an operating system image require that the operating system be restarted to configure the newly added resources. 

A Concurrent upgrade might be disruptive to operating systems or programs that do not support the upgrades while being nondisruptive to others. For more information, see 8.10, “Planning for nondisruptive upgrades” on page 374. 

## 8.1.4 Permanent upgrades 

Permanent upgrades can be obtained by using the following processes: 

GLYPH<SM590000> Ordered through an IBM marketing representative 

GLYPH<SM590000> Initiated by the client with the CIU on the IBM Resource Link 

Tip:  The use of the CIU facility for a system requires that the online CoD buying feature (FC 9900) is installed on the system. The CIU facility is enabled through the permanent upgrade authorization feature code (FC 9898). 

## Permanent upgrades that are ordered through an IBM representative 

Through a permanent upgrade, you can accomplish the following tasks: 

GLYPH<SM590000> Add processor drawers 

GLYPH<SM590000> Add Peripheral Component Interconnect Express (PCIe) drawers and features 

GLYPH<SM590000> Add model capacity 

GLYPH<SM590000> Add specialty engines 

GLYPH<SM590000> Add memory 

GLYPH<SM590000> Activate unassigned model capacity or IFLs 

GLYPH<SM590000> Deactivate activated model capacity or IFLs 

GLYPH<SM590000> Activate channels 

GLYPH<SM590000> Activate cryptographic engines 

