Preparing IBM MQ for z/OS to use the zEnterprise Data Compression Express facility

The zEnterprise Data Compression (zEDC) Express facility is available for certain models of IBM machines, using a minimum z/OS level of z/OS Version 2.1.

See IBM zEnterprise Data Compression (zEDC) for z/OS for further information.

To start using zEDC for channel compression, we must:

• Configure the zEDC Software License in the IFAPRDxx parmlib member.
• Ensure that the channel initiator user ID has READ authority to the FPZ.ACCELERATOR.COMPRESSION profile in the RACF FACILITY CLASS, or the equivalent in the external security manager (ESM) that your enterprise uses.
• Configure the channel with COMPMSG(ZLIBFAST) at both the sending and receiving ends.

Once configured, zlib compression is used to compress and decompress messages flowing across the channel.

Compression is performed in the zEDC when the size of data to be compressed is above a size defined by the zEDC Express facility, currently 4 KB. For messages below the threshold size, compression is performed in the software.

Parent topic: Monitor and control channels on z/OS