Rorke Data Galaxy HDX2 GHDX2-2430S-24F4D - Manual (Page 88)

Chapter 4: Subsystem Connection and Operation
Subsystem Connection and Operation 4-21
4.4.4 Expansion Links
A redundant-controller RAID enclosure connects to a maximum of two (2) 16
drive SAS expansion enclosures which house either SAS or SATA disk drives.
SAS link cables are provided with the expansion enclosures.
A unique enclosure ID should be individually configured for each expansion
enclosure using the rotary ID switch on its LED panel.
Figure 4-11: Expansion: Redundant Controller Configuration