[Isilon] InsightIQ root password

administrator@isilon-insightiq:~$ sudo su -
[sudo] password for administrator:
root@isilon-insightiq:~#
root@isilon-insightiq:~#
root@isilon-insightiq:~# passwd
Enter new UNIX password:
Retype new UNIX password:
passwd: Authentication token manipulation error
passwd: password unchanged