Adding Nodes Without Refragmenting

If you don’t refragment the database when adding nodes, you must clear the database and recreate the session store instead, otherwise the session store can’t use the new nodes. You should not add nodes without refragmenting the database unless you can tolerate losing all data stored in the database. However, it may be the best alternative if all of the following conditions are met:

To add nodes without refragmenting, perform the following tasks:

  1. Perform the following tasks for each server instance:
    1. Disable the server instance in the load balancer.
    2. Disable session persistence.
    3. Restart the server instance.
    4. Re-enable the server instance in the load balancer.
    5. If you do not need to maintain availability, you can disable and re-enable all the server instances at once in the load balancer. This saves time and prevents failover of outdated session data.

  2. Stop the database as described in "Stopping the HADB".
  3. Delete the database as described in "Removing a Database".
  4. Recreate the database with the additional nodes as described in "Creating a Database".
  5. Reconfigure the JDBC connection pool as described in "Setting Up the JDBC Connection Pool". You can also use the cladmin command.
  6. Reload the session persistence store. You can also use the cladmin command.
  7. Perform the following tasks for each server instance:
    1. Disable the server instance in the load balancer.
    2. Enable session persistence.
    3. Restart the server instance.
    4. Re-enable the server instance in the load balancer.
    5. If you do not need to maintain availability, you can disable and re-enable all the server instances at once in the load balancer. This saves time and prevents failover of outdated session data.


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