When you look at the Joblog of an XCOM-Transfer you might see one or more of these messages (xxxxxxx stands for deflate (compression) or inflate (decompression)):
XCOMM0934I zEDC hardware acceleration will be used for xxxxxxxXCOMM0935I zEDC hardware acceleration available for zlib xxxxxxx buffers >= nKXCOMM0936I zEDC hardware acceleration detected. However, minimum xxxxxxxx threshold nK excludes XCOM useXCOMM0937I zEDC hardware acceleration not available or not configured for xxxxxxxx
These messages are just informal and do not lead to a problem. They inform on the status of support for IBM's z/EDC hardware accelerator feature.