Specify REQTYPE=ASYNC on IXZXIXSM to indicate that the message being sent is sent asynchronously. This option is similar to REQTYPE=COMM, except that ASYNC requests that JES XCF provide recovery by resending the message if the receiving member fails prior to acknowledging the message.

This option is useful when the message data is critical to your installation's continued processing, but your installation cannot afford to wait for an acknowledgement. The sender does not need to know that the message data was received but must ensure that JES XCF will get the message to the appropriate member.