Managing Operations › Exploitation of the zIIP Processor

Exploitation of the zIIP Processor

CA Tape Encryption is designed to exploit IBM zIIP processors when they are installed and enabled on the system where CA Tape Encryption will run and the appropriate parmlib attributes are specified. By default, CA Tape Encryption will not attempt to make work eligible to run on the zIIP. You must activate zIIP processing using the zIIPExploitation= and PercentRunOnzIIP= attributes in parmlib. CA Tape Encryption is designed to run in Service Request Block (SRB) mode, a pre-requisite of zIIP processing. When the zIIP feature is activated CA Tape Encryption will create the environment necessary to schedule work on the zIIP. CA Tape Encryption allows you to specify a percentage of work that is to be made eligible to run on the zIIP.

Example: Specifying 20 percentage of work to run on the zIIP

zIIPExploitation=Y
PercentRunOnzIIP=20

Every fifth SRB will be directed to the zIIP. All encryption, decryption, compression and decompression processing runs in SRB mode; therefore the most processor intensive functions of CA Tape Encryption can be made eligible to run on the zIIP if the zIIP capacity permits it.

Note: IBM documents that work directed to the zIIP processor may not be processed on the zIIP for a number of reasons. Refer to the appropriate IBM documentation for further information on the zIIP. Only z/OS 1.6 or later releases are supported and PTFs on z/OS may be required.