Hi,
I just deployed an three datanodes cluster. But there is a problem that the
live nodes are always 0. There is no datanode connected to the namenode.
Does anybody know why?

Datenode keeps logging the following:

2010-03-16 19:41:50,379 INFO org.apache.hadoop.ipc.RPC: Server at
ubtserver01/xx.xx.xx.xx:54310 not available yet, Zzzzz...
2010-03-16 19:41:52,396 INFO org.apache.hadoop.ipc.Client: Retrying connect
to server: ubtserver01/xx.xx.xx.xx6:54310. Already tried 0 time(s).
2010-03-16 19:41:53,405 INFO org.apache.hadoop.ipc.Client: Retrying connect
to server: ubtserver01/xx.xx.xx.xx:54310. Already tried 1 time(s).
2010-03-16 19:41:54,410 INFO org.apache.hadoop.ipc.Client: Retrying connect
to server: ubtserver01/xx.xx.xx.xx:54310. Already tried 2 time(s).
2010-03-16 19:41:55,414 INFO org.apache.hadoop.ipc.Client: Retrying connect
to server: ubtserver01/xx.xx.xx.xx:54310. Already tried 3 time(s).
2010-03-16 19:41:56,416 INFO org.apache.hadoop.ipc.Client: Retrying connect
to server: ubtserver01/xx.xx.xx.xx:54310. Already tried 4 time(s).
2010-03-16 19:41:57,422 INFO org.apache.hadoop.ipc.Client: Retrying connect
to server: ubtserver01/xx.xx.xx.xx:54310. Already tried 5 time(s).
2010-03-16 19:41:58,424 INFO org.apache.hadoop.ipc.Client: Retrying connect
to server: ubtserver01/xx.xx.xx.xx:54310. Already tried 6 time(s).
2010-03-16 19:41:59,427 INFO org.apache.hadoop.ipc.Client: Retrying connect
to server: ubtserver01/xx.xx.xx.xx:54310. Already tried 7 time(s).

And the namenode has log as following:
2010-03-16 19:41:00,746 INFO org.apache.hadoop.ipc.Server: IPC Server
Responder: starting
2010-03-16 19:41:00,747 INFO org.apache.hadoop.ipc.Server: IPC Server
listener on 54310: starting
2010-03-16 19:41:00,747 INFO org.apache.hadoop.ipc.Server: IPC Server
handler 0 on 54310: starting
2010-03-16 19:41:00,748 INFO org.apache.hadoop.ipc.Server: IPC Server
handler 1 on 54310: starting
2010-03-16 19:41:00,756 INFO org.apache.hadoop.ipc.Server: IPC Server
handler 9 on 54310: starting
2010-03-16 19:41:00,756 INFO org.apache.hadoop.ipc.Server: IPC Server
handler 2 on 54310: starting
2010-03-16 19:41:00,756 INFO org.apache.hadoop.ipc.Server: IPC Server
handler 3 on 54310: starting
2010-03-16 19:41:00,756 INFO org.apache.hadoop.ipc.Server: IPC Server
handler 4 on 54310: starting
2010-03-16 19:41:00,756 INFO org.apache.hadoop.ipc.Server: IPC Server
handler 6 on 54310: starting
2010-03-16 19:41:00,792 INFO org.apache.hadoop.ipc.Server: IPC Server
handler 5 on 54310: starting
2010-03-16 19:41:00,792 INFO org.apache.hadoop.ipc.Server: IPC Server
handler 7 on 54310: starting
2010-03-16 19:41:00,792 INFO org.apache.hadoop.ipc.Server: IPC Server
handler 8 on 54310: starting

Thanks a lot.
William