NetBase for MPE Reference Guide

Chapter 12
12-4
Unplanned Failover
The following guidelines can be used for an unplanned failover. This scenario assumes that the
master will become the shadow system and the shadow will become the master. This scenario also
assumes that the master system is “dead” or unavailable.
On the shadow system:
1. Quiet the system (except for the NetBase background job).
2. Check to make sure all shadow transactions have been posted:
RUN NBCTRL.PUB.NETBASE;INFO=“SHOW POST”
3. The backlog value should be 0 and the state of POST should be IDLE.
4. Change the directory that will reflect this is the “master” system:
RUN NBCTRL.PUB.NETBASE;INFO=“CHGDIR newdir”
5. Start an online backup of the data. This is done since the condition of the original master is not
known.
6. Stop/start the NetBase background job.
7. Allow users and processing to start on the new “master”.
At this point, the shadow system is now the “master” system.