Home > Storage > PowerScale (Isilon) > Product Documentation > Management and Migration > PowerScale OneFS Authentication, Identity Management, and Authorization > ID ranges cannot overlap
In networks with multiple identity sources, ensure that the UID and GID ranges do not overlap. If UIDs and GIDs overlap, certain users could gain access to directories or files that were not intended. Additionally, do not use UIDs and GIDs below 1000. They are reserved for system accounts.