Migrate Your Local Stores
Move any local stores for your 12.x multiplex query nodes before you migrate your data to Sybase IQ 15.4. iqlsunload connects to a Sybase IQ 12.7 database with an Sybase IQ local store and creates scripts that unload its schema and data.
Start the Multiplex Write Server in Single Node Mode
To ensure a smooth multiplex migration, start the write server in single node mode to clean internal state information. To do this, start the writer node in single node mode, shutdown, start again normally, and shut down.
Start and Verify the Coordinator
In the previous section, the multiplex coordinator was started in single node mode (-iqmpx_sn) and read-only (-iqro) to perform some initial database checks. For coordinators, the server needs to reset an identity cookie before the multiplex can be used.
Manually Synchronize the Secondary Nodes
To start the secondary nodes, install Sybase IQ 15.4 and then synchronize from the coordinator node. When you migrate a query node, it becomes a reader node.
Start the Secondary Nodes
To start the secondary nodes all nodes of the multiplex must be up and running .
Set the Failover Node
After you migrate the multiplex data, connect to the coordinator, and set the failover node.