Storage1 is just directory on all nodes.
mount
/dev/sda2 on /boot type ext4 (rw,relatime,stripe=1024)
/dev/sda3 on /mnt/storage1 type ext4 (rw,relatime,stripe=256)
/dev/sda6 on / type ext4 (rw,relatime,errors=remount-ro,stripe=256)
But indeed this directory shared by NFS for another nodes...