Home > Storage > PowerScale (Isilon) > Product Documentation > Management and Migration > PowerScale OneFS Authentication, Identity Management, and Authorization > POSIX file state
The POSIX file state is best for environments with heavy read and writes from NFS or HDFS clients. If SMB clients are accessing the file, it is for read-only, and the synthetic ACL is created at access time. In the POSIX file state, the limiting factor is DACLs because only Owner, Group, and Everyone are available. Therefore, the POSIX file state supports a maximum of three DACLs.