Connecting Controller And Drive Enclosures - HP StorageWorks 2012i User Manual

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 –
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
32 HP StorageWorks 2012i Modular Smart Array user guide • March 2008
For clarity, the schematic illustrations of the controllers shown in this
In
In
Drive Enclosure
Controller A
Controller B
1A
Out
1B
Out