HP MSA 1040 HP MSA 1040 Cable Configuration Guide (762786-001, March 2014) - Page 9

Fault-tolerant cabling example, Straight-through cabling example

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Fault-tolerant cabling example The following figure shows an HP MSA 1040 array connected to two HP D2700 drive enclosures using fault-tolerant cabling. I/O modules A on the drive enclosures are shaded green. I/O modules B on the drive enclosures are shaded blue. Fault-tolerant cabling requires that you connect HP MSA 1040 controller A to I/O module A of the first drive enclosure and cascade this connection on to I/O module A of the last drive enclosure (shown in green). Likewise, you must connect HP MSA 1040 controller B to I/O module B of the last drive enclosure and cascade this connection on to I/O module B of the first drive enclosure (shown in blue). Straight-through cabling example The following figure shows an HP MSA 1040 array connected to two HP D2700 drive enclosures using straight-through cabling. Straight-through cabling requires that you connect HP MSA 1040 controller A to I/O module A of the first drive enclosure and cascade this connection on to I/O module A of the last drive enclosure (shown in green). Likewise, you must connect HP MSA 1040 controller B to I/O module B of the first drive enclosure and cascade this connection on to I/O module B of the last drive enclosure (shown in blue). IMPORTANT: Fault-tolerant cabling provides the highest level of fault-tolerance protection for the array. Using straight-through cabling can sometimes provide increased performance in the array; however, it also increases the risk of losing access to one or more enclosures in the event of an enclosure failure or removal. Fault-tolerant and straight-through drive enclosure cabling 9

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Fault-tolerant cabling example
The following figure shows an HP MSA 1040 array connected to two HP D2700 drive enclosures
using fault-tolerant cabling.
I/O modules A on the drive enclosures are shaded green. I/O modules B on the drive enclosures
are shaded blue. Fault-tolerant cabling requires that you connect HP MSA 1040 controller A to
I/O module A of the first drive enclosure and cascade this connection on to I/O module A of the
last drive enclosure (shown in green). Likewise, you must connect HP MSA 1040 controller B to
I/O module B of the last drive enclosure and cascade this connection on to I/O module B of the
first drive enclosure (shown in blue).
Straight-through cabling example
The following figure shows an HP MSA 1040 array connected to two HP D2700 drive enclosures
using straight-through cabling.
Straight-through cabling requires that you connect HP MSA 1040 controller A to I/O module A of
the first drive enclosure and cascade this connection on to I/O module A of the last drive enclosure
(shown in green). Likewise, you must connect HP MSA 1040 controller B to I/O module B of the
first drive enclosure and cascade this connection on to I/O module B of the last drive enclosure
(shown in blue).
IMPORTANT:
Fault-tolerant cabling provides the highest level of fault-tolerance protection for the
array. Using straight-through cabling can sometimes provide increased performance in the array;
however, it also increases the risk of losing access to one or more enclosures in the event of an
enclosure failure or removal.
Fault-tolerant and straight-through drive enclosure cabling
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