HP MSA 1040 SAN Storage User Manual
Page 23
Connecting controller and drive enclosures
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Figure 11 Cabling connections between MSA 1040 controllers and SFF drive enclosures
The figure above provides sample diagrams reflecting cabling of MSA 1040 controller enclosures and
D2700 6 Gb drive enclosures.
The diagram at left shows fault-tolerant cabling of a dual-controller enclosure and D2700 6 Gb drive
enclosures featuring dual-expansion modules. Controller module 1A is connected to expansion module
2A, with a chain of connections cascading down (blue). Controller module 1B is connected to the lower
expansion module (4B) of the last drive enclosure, with connections moving in the opposite direction
(green). Fault-tolerant cabling allows any drive enclosure to fail—or be removed—while maintaining
access to other enclosures.
The diagram at right shows the same storage components connected using straight-through cabling. Using
this method, if a drive enclosure fails, the enclosures that follow the failed enclosure in the chain are no
longer accessible until the failed enclosure is repaired or replaced.
Both illustrations in
show the maximum number of supported enclosures that can be cabled
together in an MSA 1040 system configuration: up to four enclosures (including the controller enclosure).
P1
Controller A
Controller B
1A
1B
P2
P1
P1
P1
P1
P1
2A
2B
3A
3B
4A
4B
P2
P2
P2
P2
P2
Fault-tolerant cabling
Straight-through cabling
P1
Controller A
Controller B
P2
P1
P1
P1
P1
P1
P2
P2
P2
P2
P2
1A
1B
2A
2B
3A
3B
4A
4B