Use the QDIOSYNC trace when you are re-creating a problem with an OSA-Express2 or later connection. QDIOSYNC enables automatic capture of OSA-Express2 or later diagnostic data without using the HMC console, reducing the likelihood of overwriting pertinent diagnostic data. QDIOSYNC also uses other system facilities to enable host-initiated capture of OSA-Express2 or later diagnostic data and to initiate a host dump simultaneously with the host-initiated capture of OSA-Express2 or later diagnostic data. These other system facilities include the z/OS® MPF exit facility and the SLIP PER trap command.

Specifying the VTAM®-supplied MPF exit routine module name [USEREXIT(IUTLLCMP)] in the MPFLSTxx member of SYS1.PARMLIB and activating that member result in a CAPTURE signal being sent to all armed OSA-Express2 or later adapters when the corresponding message is issued. See z/OS MVS Installation Exits for more information about the use of MPF and the MPF PARMLIB member.

Specifying ACTION=RECOVERY on a SLIP PER trap command drives the executing FRR with an ABEND06F abend when the SLIP trap is triggered. Both the VTAM and TCP/IP FRRs detect the ABEND06F abend and initiate sending a CAPTURE signal to all armed OSA-Express2 or later adapters.

Do not use QDIOSYNC to unconditionally arm an OSA-Express2 or later adapter when it is shared by other operating systems and those operating systems might use this function. In this case, the function should be coordinated between all sharing operating systems.