# Encryption

#### Creating an Encrypted File System

To use the file system encryption function, you need to authorize SFS Capacity-Oriented to access KMS when creating an SFS Capacity-Oriented file system. If you have the Security Administrator rights, grant SFS the permissions to access KMS directly. Otherwise, you need to contact the system administrator to obtain the "Security Administrator" rights first. For details, see File System Encryption.

For SFS Turbo file systems, no authorization is required.

You can create a file system that is encrypted or not, but you cannot change the encryption settings of an existing file system.

For details about how to create an encrypted file system, see Step 1: Create a File System.

#### Unmounting an Encrypted File System

If the CMK used by the encrypted file system is disabled or planned to be deleted, the file system can only be used within a certain period of time (30s by default). Exercise caution in this case.

For details about how to unmount the file system, see Step 3: Unmount a File System.

Parent topic: Management