I'm trying to add Isilon device as managed host but I'm unable to select any host as remote agent server. Is special configuration must take place? I can install local agents on any windows box, but any windows box can not be selected
Can you confirm that you have the UNIX module installed? If not, you will need to install this.
From EMC Isilon NFS devices:
"NFS managed hosts require the UNIX® module to be installed during the One Identity Manager installation and configuration process."