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At the most basic level, a folder is a container for BIG-IP configuration objects and files on a BIG-IP device. Virtual servers, pools, and self IP addresses are examples of objects that reside in folders on the system. Folders resemble standard directories, in that the system includes a root folder (represented by the / symbol) that is the parent for other folders on the system.
A folder can contain other folders.
One of the important ways that you can use folders is to set up full or granular synchronization and failover of BIG-IP configuration data in a device group. You can synchronize and fail over all configuration data on a BIG-IP device, or you can synchronize and fail over objects within a specific folder only.
For each partition on the BIG-IP system, there is an equivalent high-level folder. For example, for partition Common, there is a corresponding high-level folder named /Common. This close association of administrative partitions to folders means that when you use the BIG-IP Configuration utility to create objects on a BIG-IP device, the system puts those objects in the current partition, in a folder that you choose. Examples of BIG-IP objects that reside in folders are virtual servers, pools, and self IP addresses.
If you create another administrative partition, such as partition App_A, the BIG-IP system automatically creates a high-level folder named /App_A. You can then create BIG-IP configuration objects that pertain to application A by changing the current partition to App_A and then either creating the objects in folder /App, or creating a sub-folder within /App_A and then navigating to that sub-folder.
The folder in which an object resides automatically becomes part of the object name. For example, if you create a pool in partition Common, in folder /Common, and then name the pool my_pool, the full name of the pool on the system is /Common/my_pool. If you create a pool in partition App_A, in folder /App_A, then the full name of the pool is /App_A/my_pool.
When you create two BIG-IP objects in separate folders, where one object references the other, the referenced object must reside in /Common or a sub-folder of /Common.
For example, if you create a virtual server in folder /App_B, and the virtual server references a load balancing pool, the pool object must reside in folder /Common or in a sub-folder of /Common.