i did that in isilon UI [ web interface ] . go to cluster management --> access management  select system under users tab and select FILE:system under select a provider tab , then click admin click view details there u see password: no value [ edit ] click on that edit and type what ever password u want ( same thing for root ). there should be easier way through CLI [IMAGE]
How can we change Isilon root and admin default passwords  Thanks in advance
Changing Isilon root and admin passwords