Fault-Tolerant And Straight-Through Cabling; P2000 G3 Single Drive Enclosure Expansion Configurations; Adding A Single P2000 6Gb Drive Enclosure; Adding A Single D2700 6Gb Drive Enclosure - HP P2000 Configuration Manual

Fault-tolerant and straight-through cabling

P2000 G3 MSA System firmware supports both fault-tolerant and
straight–through SAS cabling. Fault-tolerant cabling allows any drive
enclosure to fail or be removed while maintaining access to other
enclosures. When connecting multiple drive enclosures, use fault-tolerant
cabling to ensure the highest level of fault tolerance. Some mixed-connect
cabling configurations might require the use of straight-through cabling,
which does not provide the same level of fault-tolerance as fault-tolerant
cabling, but does provide some performance benefits as well as ensuring
that all disk are visible to the array.
The following figures shows a P2000 G3 MSA System connected to two
D2700 6Gb 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 red. Fault-tolerant cabling requires that you
connect P2000 G3 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 P2000
G3 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 red).
Figure 2 Fault-tolerant cabling example
.
The following figure shows a P2000 G3 MSA System connected to two
D2700 6Gb drive enclosures using straight-through cabling.
Straight-through cabling requires that you connect P2000 G3 controller
A to I/O module A of the first drive enclosure which is in turn connected
to I/O module A of the last drive enclosure (shown in green). P2000
G3 controller B is connected to I/O module B of the first drive enclosure
which is in turn connected to I/O module B of the last drive enclosure
(shown in red).
IMPORTANT:
Fault-tolerant cabling provides the highest level of fault-tolerance
protection for the array. Please note that while using
straight-through cabling can sometimes provide increased
performance in the array, it also increases the risk of losing
access to one or more enclosures in the event of an enclosure
failure or removal.
Figure 3 Straight-through cabling example
.
P2000 G3 single drive enclosure
expansion configurations
The following illustrations show examples of expanding storage from a
P2000 G3 controller enclosure to a single drive enclosure.

Adding a single P2000 6Gb drive enclosure

The following figure shows a dual-controller P2000 G3 MSA System
connected to a dual-controller P2000 6Gb drive enclosure in both single
path configuration (1) and a dual path configuration (1 and 2). Data
throughput in the array performs at the 6Gbps rate, as both the controller
enclosure and the drive enclosure support 6Gbps speeds (assuming that
all disk drives in the array are also 6Gb drives).
Figure 4 P2000 G3 connected to a single P2000 6Gb drive enclosure
.

Adding a single D2700 6Gb drive enclosure

The following figure shows a dual-controller P2000 G3 MSA System
connected to a dual-controller D2700 6Gb drive enclosure in both single
path configuration (1) and a dual path configuration (1 and 2). Data
throughput in the array performs at the 6Gbps rate, as both the controller
enclosure and the drive enclosure support 6Gbps speeds (assuming that
all disk drives in the array are also 6Gb drives).
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