Before mounting a volume, create a mount point:
$ sudo mkdir -p /mnt/mount_point_name
Mount the volume:
$ sudo mount -o discard,defaults /dev/vdb /mnt/mount_point_name
Keeping mount point through reboots
You need to add a record into the "fstab" config if you want OS to mount a volume automatically after boot:
$ echo '/dev/vdb /mnt/mount_point_name ext4 defaults,nofail,discard 0 0' | sudo tee -a /etc/fstab