IP address changes in a cluster ?

[Jörg Nowak]

Is it possible to change the IP adresses in an existing cluster ?

We tried the following :
- populate a cluster with 2 computers (2 ndb nodes on each) with some data, ndb_mgm is on a different machine (control machine)
- the data are in a storage area network (SAN)
- stop the cluster (kill the nodes, the mgm node too)
- preparing two ohter machines for beeing a cluster (same hardware and software configuguration only different ip)
- using the data from the SAN in the new machines
- try the restart the new cluster with the same data from the control maschine, the mgm node first
- the mgm node starts with the new ip addresses but the start of the ndb nodes failed:

we get the error during start up the new cluster:

2005-04-07 14:25:41 [MgmSrvr] INFO -- Mgmt server state: node id's 1 3 7 not connected but reserved
2005-04-07 14:25:41 [MgmSrvr] INFO -- Mgmt server state: nodeid 3 freed, m_reserved_nodes 0000000000000082.
2005-04-07 14:25:44 [MgmSrvr] INFO -- Mgmt server state: nodeid 3 reserved for ip 10.1.2.24, m_reserved_nodes 000000000000008a.
2005-04-07 14:25:44 [MgmSrvr] WARNING -- Allocate nodeid (3) failed. Connection from ip 10.1.2.24. Returned error string "Id 3 already allocated by another node."

The ip 10.1.2.24 is the ip of the new cluster. Why is node 3 allocated by another node ?
Any ideas ?

We use MySQL Cluster 4.1.9 on Suse Linux 64 bit (on all machines of course).

Joerg Nowak