Writer : http://www.ischo.net -- ischo // System Engineer
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Change hostname in AIX

1. Apply hostname information in inet0 device to ODM permanently.
   # chdev -l inet0 -a hostname=<new hostname>
   or
   # smitty hostname

2. Change hostname ( affected now, but after reboot will not changed)
   # hostname <new hostname>

3. change hostname at command 'uname'
   # uname -S <new hostname>
   or
   run # /etc/rc.net  
  * uname command's result will not change after run 'hostname <newhostname>' command.

     it need to run 'uname -S'. it will be affected after reboot, because booting script /etc/rc.net including 'uname -S' command.

4. edit /etc/hosts file to apply new hostname

 # vi /etc/hosts

 <interface IP>     <new hostname>

ex) 192.168.10.2     oldhostname   ->   192.168.10.2     newhostname

5. edit DNS file (ex:/etc/resolv.conf) if necessary.

# vi /etc/resolv.conf