HP MSA 2050 User Manual page 20

The diagram at left (above) shows fault-tolerant cabling of a dual-controller enclosure cabled to either the
MSA 2050 LFF Disk Enclosure or the MSA 2050 SFF Disk Enclosure 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 (5B), 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 (above) shows the same storage components connected using straight-through cabling. Using this
method, if a drive enclosures fails, the enclosures that follow the failed enclosure in the chain are no longer accessible
until the failed enclosure is repaired or replaced.
Figure 11 (page 21) provides a sample diagram reflecting fault-tolerant cabling of a maximum number of supported MSA
2050 enclosures.
20 Installing the enclosures