The variables RES_RETRY and RES_TIMEOUT are useful on AIX systems for resolving name services problems.

Add them to the /etc/environment file and this will help to speed up the failover times to the next DNS server in the /etc/resolv.conf file if the a server is not responding.

These values mean that DNS requests (nslookup) will timeout after 1 retry with a 1 second wait between retries, before moving on the the next DNS server in the list.

 

RES_RETRY=1

RES_TIMEOUT=1