IBM Spectrum  Archive EE node 0 N U M A 0 Storage Zone 1 Zone 2 Zone 3  Zone 4 Zone 5 TS4500 Tape Drive Tape  Drive 8Gbps FC switch N U M A 1 Tape Drive Tape  Drive IBM Spectrum  Archive EE node 1 N U M A 0 N U M A 1 Tape Drive Tape  Drive Tape Drive Tape  Drive Figure 3-3 Internal diagram of two nodes running off NUMA 0 connected to an 8 Gb switch with four  drives per node and one external storage unit Note:  Figure 3-3 shows a single Fibre Channel cable going to the drive zones. However,  generally you should have a second Fibre Channel cable for failover scenarios. This is the  same reason why the zone that goes to the external storage unit has two Fibre Channel  cables from 1 HBA on each server. This diagram should be used as a guide on how you would set up your own environment for  best performances. This is one of many configurations. For instance, if you have more drives,  you can add more tape drives per zone, or add more HBAs on each server and create a new  zone. 46  IBM Spectrum Archive Enterprise Edition V1.2.6: Installation and Configuration Guide