hacmp fall over problem, db2 slow start

Hi,

DB2 HA on two AIX server A and B, HACMP take over test is OK.
but when we issue"halt -q" on on server A, B can take over all the
resource of A but it is very slow when it come to "db2start", 16nodes
start cost 30 minutes। but when started, it works well.

some problems about networking is reported:
1. the service ip of B is moved to another interface. also the service
ip of A is moved to the same interface.
2। "Interface 192.168.7.3 has failed on node PDBA","Interface
192.168.7.3 is now available on node PDBA". 7.3 is bootip of B.

for 1, why service ip for B is moved? is it normal?
for 2, the reason? what it is doing?


Thank you.

.