Jsiva,
This is no problem, Just ensure that you set the run time parameters for each node :
smitty cm_run_time.select
Host use NIS or name server = yes
Then if NIS causes a problem during failover HACMP will disable it. I have implemented a few clusters using NIS to sync. the user definitions.
Cheers
PSD
IBM Certified Specialist - AIX V4.3 Systems Support
IBM Certified Specialist - AIX V4 HACMP