# File Server Configuration

File server protection in Commvault is organized into the following hierarchy:

- File server

- Backup set

- Subclient

Each level provides a different level of organization and configuration. In most environments, subclients are the primary object used to define protected content and backup behavior.

## File servers

A file server represents a protected Windows, UNIX, or Mac file system.

The file server details page provides information about:

- Server name

- Server type

- Operating system version

- Software update status

From the file server details page, you can:

- Perform system state backup operations

- Perform full system restore operations

- Create additional subclients

- Install additional Commvault software packages

- Update software

- Retire a server

## Backup sets

A backup set organizes protected file system content.

Backup sets contain one or more subclients and provide the structure for managing file system protection.

Most environments use the default backup set.

Note

You cannot delete the default backup set.

## Subclients

Subclients are the primary unit of protection for file system data.

A subclient defines the content that is protected and the settings that are used to protect it.

Create additional subclients when different data sets require different:

- Recovery point objectives (RPOs)

- Retention requirements

- Backup schedules

- Storage policies

- Performance settings

### Subclient settings

Subclients include settings that control:

- Protected content

- Backup schedules

- Retention requirements

- Storage policies

- Performance behavior

- Security permissions

- Pre-process and post-process scripts

These settings allow different data sets to be protected and managed independently.

### Performance settings

Subclients include settings that control how backup operations read and process data.

Common performance settings include:

- Backup streams, which can improve backup performance for large data sets.

- Application read size, which controls how much data is read from a file during each read operation.

  Application read size affects backup performance but does not affect the content that is protected.

  In most environments, the default value provides optimal performance and does not require modification.

### Information available on the subclient details page

The subclient details page displays:

- Latest backup information

- Next scheduled backup

- Associated storage policy

- Protected content

- Security settings

### Available operations

From the subclient details page, you can:

- Run backup operations

- Run restore operations

- Modify protected content

- Delete a subclient

Note

You cannot delete the default subclient.

## Optimized backup of hard link files

To enable optimized backup of hard link files on UNIX file systems, see Configuring Backups for Hard Links.

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