Datacom Compatibility with z/EDC Hardware Compression

Document ID : KB000117089
Last Modified Date : 29/10/2018
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Question:
Is Datacom data eligible to take advantage of z/EDC hardware compression?
 
Environment:
z/OS

 
Answer:
z/EDC is a hardware compression and is not suitable for Datacom/DB file due to Data Dictionary Building Block (DBB) overhead paired for each block.
Benefits are realized with large Block Sizes such as 4K. 
 
Additional Information:
If you are using the CA Datacom/DB Presspack component, you can generate your RDT with METHOD=ZL to exploit the Hardware Compression. 
 
For more information on the Presspack component, refer to CA Datacom Core - 15.1 and search for ‘presspack’.