Chapter 2. Hardware 17
Capacity Upgrade on Demand can be used to enable these upgrades concurrently
(see “Definitions” on page 18 for more information).
Capacity BackUp provides the ability to quickly and nondisruptively bring additional
CPs online on a temporary basis, to assist in recovery from a disaster (see “Capacity
Back Up” on page 20 for more information).
Customer Initiated Upgrade allows a customer to upgrade their CPC without the
involvement of an IBM service representative (see “Definitions” on page 18 for more
information).
On/Off Capacity Upgrade on Demand allows spare PUs to be turned on and then off
again to meet peak processing requirements.
򐂰 Plan Ahead for nondisruptive I/O upgrades provides for the installation of spare I/O cages
on a new CPC, allowing later concurrent installation of new I/O cards. Plan Ahead can
also be used to enable nondisruptive memory upgrades to the maximum amount of
memory supported on each model.
򐂰 Support for CICS Subsystem Storage Protection.
򐂰 Support for CICS Subspace Group Facility.
򐂰 Ability to run multiple independent operating systems on a CPC—known as Logical
Partitions.
򐂰 PAR dynamic storage reconfiguration - Provides the ability to nondisruptively move CPC
storage from one LPAR to another. This facility has been enhanced to remove the
restriction of storage reconfiguration only being possible between adjacent LPARs.
򐂰 Automatic Reconfiguration Facility (ARF) - A facility that z/OS can invoke that
automatically resets a LPAR, moves storage to that LPAR from a donor LPAR, and
deactivates the donor LPAR. This would typically be used with hot standby or backup
LPARs. If ARF is being used, the I/O Interface Reset facility should not be enabled in the
PR/SM Reset profile.
򐂰 Automatic I/O Interface Reset Facility - This facility allows an operating system to reset its
I/O configuration prior to entering a disabled wait. This facility minimizes the risk of shared
DASD, causing a hang within a sysplex. This facility should not be used if ARF is being
used.
򐂰 System Isolation Function that is exploited by Sysplex Failure Manager (SFM).
򐂰 Ability to move to a new CFCC level without requiring a Power-On-Reset. Ability to add an
LPAR nondisruptively.
2.2.3 Concurrent upgrade
Current CPCs have the capability of concurrent upgrades, providing additional capacity with
no outage. In most cases, with prior planning and operating system support, a concurrent
upgrade can also be nondisruptive to the operating system, meaning that capacity can be
added (and in some cases removed) without impacting the running systems. The LIC -
Configuration Control (LIC-CC) provides for CPC upgrade with no hardware changes by
enabling the activation of additional installed capacity.
Note: Be aware that the above information may differ between different CPCs. To find the
appropriate information for your CPC read the Reference Guide for the associated CPC.
There are also IBM Redbooks available that discuss the subject for the z900 and z990.
Refer to the IBM Redbooks IBM eServer zSeries 900 Technical Guide, SG24-5975, and
IBM eServer zSeries 990 Technical Guide, SG24-6947.

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