Dot Hill Systems 4524 - Reverse Cabling between a Dual-Controller 2 U Enclosure and Mixed Drive Enclosures; Straight-Through Cabling between a Dual-Controller 2 U Enclosure and Mixed Drive Enclosures

46 Installing the enclosures
Figure 40 Reverse cabling between a dual-controller 2U enclosure and mixed drive enclosures
Figure 41 Straight-through cabling between a dual-controller 2U enclosure and mixed drive enclosures
The diagrams above show dual-controller enclosures cabled to drive enclosures featuring dual-expansion
modules. In each of the examples shown above, a 4U drive enclosure is included with 2U drive enclosures
within the RAID-array cascade. Figure 40 shows reverse-cabling and Figure 41 shows straight-through
cabling. Cabling logic is explained in the narrative supporting Figure 38 on page 44.
Controller A
Controller B
In
Out
In
Out
In
Out
In
Out
Controller
enclosure
0
Drive
enclosure
1
Drive
enclosure
2
Drive
enclosure
3
In
Out
In
Out
0A
0B
1A
1B
2A
2B
3A
3B
Controller A
Controller B
In
Out
In
Out
In
Out
In Out
Controller
enclosure
0
Drive
enclosure
1
Drive
enclosure
2
Drive
enclosure
3
In Out In Out
0A
0B
1A
1B
2A
2B
3A
3B