Lenovo ThinkServer Storage SA120 (English) User Guide and Hardware Maintenance - Page 31

5 Slot 4 for a 3.5-inch drive 7 Slot 6 for a 3.5-inch drive 9 Slot 8 for a 3.5-inch drive 11 Slot 10 for a 3.5-inch drive 6 Slot 5 for a 3.5-inch drive 8 Slot 7 for a 3.5-inch drive 10 Slot 9 for a 3.5-inch drive 12 Slot 11 for a 3.5-inch drive The following illustration shows the slots and connectors on the rear of the backplane. Figure 13. Slots and connectors on the rear of the backplane 1 Power supply 1 connector 3 Slot 12 for a 2.5-inch drive 5 Rear I/O module 2 connector 7 Slot 14 for a 2.5-inch drive 9 Fan assembly 2 connector 2 Fan assembly 1 connector 4 Slot 13 for a 2.5-inch drive 6 Rear I/O module 1 connector 8 Slot 15 for a 2.5-inch drive 10 Power supply 2 connector Connecting the storage arrays You can connect up to eight storage arrays to a server. When you connect only one storage array to a server, the connection is referred to as basic mode. When you connect two to eight storage arrays to a server, the connection is referred to as cascading mode. Notes: • To connect the storage arrays, the target server must have a RAID card or a Host Bus Adapter (HBA) installed. • Depending on the model, your storage arrays might look slightly different from the illustrations in this topic. Connecting a storage array to a server To connect a storage array to a server, do the following: 1. Connect one end of a mini-SAS signal cable to the SAS-in connector on a rear I/O module of the storage array. 2. Connect the other end of the mini-SAS signal cable to an available mini-SAS connector on the RAID card or the Host Bus Adapter in the server. For more information about the RAID card or the Host Bus Adapter, refer to the user guide of your server. 3. For a storage array with two rear I/O modules, you can repeat step 1 and step 2 to connect another mini-SAS signal cable to the server and the secondary rear I/O module. Note: Connecting a storage array to a server through two rear I/O modules provides redundancy. The redundancy helps avoid significant interruption to the connection of the storage array when a rear I/O module fails. Chapter 2. Product overview 19