Hey, 

we want to add AD group permission recursively to one of our folders.

When doing it through windows it takes long time till all permissions applied to subdirectories and files.

there is option to append new ACL to folder through isilon and not replace all permissions ?

clone & inherit option in Permission repair job replace all ACLs of the folders and files and not append the new ACL to it.

maybe chmod -R +a...... ?