Synology RackStation RC18015xs+ Quick Installation Manual page 13

4 Connect the expansion unit to both RackStation units with mini-SAS cables.
a Connect one end of mini-SAS cable to the SAS-OUT port on a
RackStation, and the other end to the SAS-IN port on SAS module A of
the expansion unit.
b Connect one end of mini-SAS cable to the SAS-OUT port on the other
RackStation, and the other end to the SAS-IN port on SAS module B of
the expansion unit.
To add more expansion units, please refer to Add More Expansion Units
Note:
to the HA Cluster on page 26.
5 Power on the RackStation.
Note:
1. When the RackStation units are in normal operation, your expansion units
will automatically power on one by one if correctly connected. However, if you
directly remove the mini-SAS cable from the system during operation, next
time when you connect the expansion units to the system, you will need to
press the power button manually.
2. We recommend to power on both the RackStation units before proceeding
with DSM installation and HA cluster configuration. If you power on only
one RackStation to install DSM, you will still need to manually power on
the other RackStation after the installation so as to continue the HA cluster
configuration.
Chapter 2: Hardware Setup 13