Implementing and Managing APPC Protected Conversations

Chapter 5. Sample scenario: IMS to IMS 75

Figure 5-7 IMS log records

After IMS restart the In-Doubt Unit of Work can be resolved and the RIS can be removed by

IMS. Figure 5-8 shows the IMS DFS0699I message written during IMS restart to indicate the

Abort processing was completed for the Unit of Work.

Figure 5-8 IMS restart message to indicate UOW abort processing has completed

It should be noted that we could have used the IMS /CHANGE UOR command to abort the

in-doubt UOR since the ATB message indicated back out processing for the LUWID.

5.3 How to handle failure scenarios

In the case where the Unit of Work is In_Flight or In_Prepare status IMS, APPC/MVS and

RRS can perform the ABORT processing to back out the changes to resources.

For In-Doubt processing IMS, APPC/MVS, and RRS must work together to provide resolve

in_doubt processing. What needs to be determined is should the Unit of Work be committed

or aborted. If a resource manager voted no during the prepare stage then the Unit of Work

needs to be aborted. However, if all resource managers voted yes during prepare phase then

the work needs to be committed. The resolve in_doubt processing requires network flows;

08 RECORD – IMS2IMP application program scheduled

00000000 00700000 0800C9D4 E2F2C9D4 D7400100 00000101 00000000

00000020 0003C9D4 E2C94040 4040

000000AF0000000

56 RECORD - IMS external subsystem support recovery log record

00000000 005C0000 56070000 C9D4E2C9 40404040 00000003 C9D4E2F2 C9D4D740 0000000