How to add a new SQL node (no replies)

Hi,

I have a cluster with four nodes:

1x MGN
1x SQL
2x Data nodes

Now I would like to turn my MGN also in a backup SQL node. Therefor I copied the my.cnf from the existing SQL node, increased the server-id configuration and restarted the mysql daemon.

I can't find any errors in the log file:

2014-04-23 15:19:42 15009 [Note] NDB Binlog: starting log at epoch 1587942/8
2014-04-23 15:19:42 15009 [Note] NDB Binlog: ndb tables writable
2014-04-23 15:19:42 15009 [Note] NDB Binlog: Node: 2, subscribe from node 4, Subscriber bitmask 010
2014-04-23 15:19:42 15009 [Note] NDB Binlog: Node: 3, subscribe from node 4, Subscriber bitmask 010


But when I log into that new SQL node, I can't find my database which exists on the other SQL node. Do I make a general error?

My idea is to use one SQL node as access point for my application and the other one as backup and for ALTER statements. Is this a good setup?

Thanks for your help.
Roman