To verify the file system in use for each volume on your instance, connect to your instance and run the file -s command.
Example: File Systems on a Nitro-based Instance
The following example shows a Nitro-based instance that has a boot volume with an XFS file system and an additional volume with an XFS file system.
sudo file -s /dev/nvme?n*sudo
Example: File Systems on a T2 Instance
The following example shows a T2 instance that has a boot volume with an ext4 file system and an additional volume with an XFS file system.
sudo file -s /dev/xvd*sudo