If I change the IP address of a DNS hostname, do I have to kill -9 the dsmc
scheduler process to make it respawn and re-lookup the hostname's IP
address?

Or will it periodically do DNS lookups and will learn the new address on
its own without manual intervention?

No config file changes -- the hostname itself will stay the same; the IP
address for that record in DNS will change.

I haven't seen anything in the manual that talks about this point.

-Dan