CPACFCentral Processor Assist for Cryptographic Functions (IBM Corp.)
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The difference for customers taking delivery of IBM z9-109 models is FDRCRYPT will employ the new special purpose CPACF hardware to encrypt data during backups and decrypt that data during a restore.
The hardware CCF or CPACF modules must be enabled with configuration data by the local IBM engineer, which is a separately orderable feature and requires a processor power-on-reset (POR) to complete the loading of the data into the crypto modules.
CPACF helps reduce both the CP time and elapsed time for encryption.