8.1.3 Concurrent and nondisruptive upgrades 8.1.4 Permanent upgrades Permanent upgrades that are ordered through an IBM representative Depending on the effect on the system and application availability, upgrades can be classified  in the following manner: 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. This type of upgrade requires turning off the hardware that is being upgraded. Examples  include memory upgrades to a z15 T01 max 34. Nondisruptive  upgrades do not require the software or operating system to be restarted  for the upgrade to take effect.  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. Permanent upgrades can be obtained by using the following processes: 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). Through a permanent upgrade, you can accomplish the following tasks: GLYPH<SM590000> Concurrent GLYPH<SM590000> Non-concurrent GLYPH<SM590000> Nondisruptive GLYPH<SM590000> Disruptive GLYPH<SM590000> Ordered through an IBM marketing representative  GLYPH<SM590000> Initiated by the client with the CIU on the IBM Resource Link 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 336  IBM z15 (8561) Technical Guide Vital product data  (VPD) Information that uniquely defines system, hardware, software, and microcode elements of a  processing system. Term Description