Compaq AA-Q88CE-TE Changing a Facility, Starting and Setting Up RTR Creating a Recovery Journal

Starting and Setting Up RTR

2.3Creating a Recovery Journal

•The operator should move any duplicate copies of journal files to a location other than the rtrjnl/groupname directory so that RTR will see only the one it created.

•Track duplicate copies of journal files in the log file to prevent RTR seeing more than the one it created and issuing the SPUJOUFIL error message.

•If it is determined that a journal is SPURIOUS by means other than improper copying, then a backup copy followed by a destruction of the transactions contained in a journal can be performed by the CREATE JOURNAL/SUPERCEDE command.

2.4Changing a Facility

RTR facilities can be altered either by deleting and re-creating them using the delete facility create facility commands. Alternatively, you can use the extend facility and trim facility commands.

With sufficient redundancy in a system, facility modification can be carried out with minimal interruption to the application.

Note

The RTR facility defines the nodes used by an application, and the roles (frontend, router, backend) they may assume. You do not need to change facility definitions in the event of node or link failures.

In the example in Figure 2–1, assume that the FE3 node is being removed from the FUNDS_TRANSFER facility. Since FE3 is a frontend for this facility, only the routers (TR1 and TR2) need be reconfigured. The routers can be reconfigured one after another, so that the service provided to the remaining frontends (FE1 and FE2) is not interrupted.

Example 2–3 shows the delete facility and create facility commands that are issued from node BE1 (for example), in order to achieve this reconfiguration.

2–4Starting and Setting Up RTR