Isilon chgrp with AD authentication

Hi,

I have a Isilon cluster of X200 and X400 nodes with OneFs 7.1.x.x

The cluster is connected to a AD server, users and groups are listed.

The SMB shares are accessible for the workstations but it seems that I can't change the grp ownership from any other machine but on the Isilon cluster.

On linux the chgrp command doesn't give any error but it does nothing.

On windows it looks like that the grp is changing (on the same win machine shows the new setting) but on the cluster I see the original grp ownership, don't see any change.

Could someone help me set it up so that the chgrp does actually change for the folders/files?

Many thx