HP AA988A HP StorageWorks 2012sa Modular Smart Array user guide (488320-002, J - Page 33

Connecting Controller and Drive Enclosures

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Connecting Controller and Drive Enclosures Use the supplied SAS cables to connect a controller enclosure to up to three drive enclosures. Figure 2-4 and Figure 2-5 show the recommended fault-tolerant cabling patterns. In an enclosure, the upper module is designated A and the lower module is designated B. When connecting multiple drive enclosures, use reverse cabling to ensure the highest level of fault tolerance. For example, Figure 2-5 shows controller A connected to expansion module 1A, and the chain of connections continuing down. Controller B is connected to the lower module (B) of the last drive enclosure in the chain, with connections moving in the opposite direction. Fault-tolerant cabling is recommended because it enables the controllers to access remaining drive enclosures if any one drive enclosure fails. However, the system also supports non-fault-tolerant cabling using the supplied SAS cables. Figure 2-6 shows non-fault-tolerant cabling between a controller and up to three drive enclosures. Note - For clarity, the schematic illustrations of the controllers shown in this section show only relevant details such as expansion ports. For detailed illustrations showing all components, see "Hardware Components and LEDs" on page 13. Controller A Controller B In Out 1A In Out 1B Figure 2-4 Cabling Connections Between One Controller Enclosure and One Drive Enclosure Chapter 2 Installing and Cabling Enclosures 33

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Chapter 2
Installing and Cabling Enclosures
33
Connecting Controller and Drive Enclosures
Use the supplied SAS cables to connect a controller enclosure to up to three drive
enclosures. Figure 2-4 and Figure 2-5 show the recommended fault-tolerant cabling
patterns. In an enclosure, the upper module is designated
A
and the lower module is
designated
B
.
When connecting multiple drive enclosures, use reverse cabling to ensure the
highest level of fault tolerance. For example, Figure 2-5 shows controller A
connected to expansion module 1A, and the chain of connections continuing down.
Controller B is connected to the lower module (B) of the last drive enclosure in the
chain, with connections moving in the opposite direction.
Fault-tolerant cabling is recommended because it enables the controllers to access
remaining drive enclosures if any one drive enclosure fails. However, the system
also supports non-fault-tolerant cabling using the supplied SAS cables.
Figure 2-6 shows non-fault-tolerant cabling between a controller and up to three
drive enclosures.
Note –
For clarity, the schematic illustrations of the controllers shown in this
section show only relevant details such as expansion ports. For detailed illustrations
showing all components, see “Hardware Components and LEDs” on page 13.
Figure 2-4
Cabling Connections Between One Controller Enclosure and One
Drive Enclosure
In
Out
In
Out
Controller B
Controller A
1A
1B