> # Read-Only Zone Configuration Guidelines

> Follow these guidelines when configuring read-only zones:

> - If read-only zones are implemented, the switch prevents write access to user data within the zone.
> - If two members belong to a read-only zone and to a read-write zone, the read-only zone takes priority and write access is denied.
> - LUN zoning can only be implemented in Cisco MDS 9000 Family switches. If LUN zoning is implemented in a switch, you cannot configure interop mode in that switch.
> - Read-only volumes are not supported by some operating system and file system combinations (for example, Windows NT or Windows 2000 and NTFS file system). Volumes within read-only zones are not available to such hosts. However, if these hosts are already booted when the read-only zones are activated, then read-only volumes are available to those hosts.
> - The read-only zone feature behaves as designed if either the FAT16 or FAT32 file system is used with the previously mentioned Windows operating systems.

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