fsType is the filesystem type of the volume that you want to mount.
Tip: Ensure that the filesystem type is supported by the host operating system.
Examples: "ext4", "xfs", "ntfs".
Implicitly inferred to be "ext4" if unspecified.
More info: https://kubernetes.io/docs/concepts/storage/volumes#rbd
Represents a Rados Block Device mount that lasts the lifetime of a pod.