Since the Linux system abort booting when it fails to mount fstab entries, user may not able to see an error message when we use fstab to mount /var/lib/scylla on AMI. Instead of abort booting, we can just abort to start scylla-server.service when RAID volume is not mounted, using RequiresMountsFor directive of systemd unit file. See #3640 Signed-off-by: Takuya ASADA <syuu@scylladb.com> Message-Id: <20180824185511.17557-1-syuu@scylladb.com>