HPE MSA 2050 Configuration Manual page 8

Straight-through cabling does not provide the same level of fault-tolerance as fault-tolerant cabling. Straight-
through cabling does provide some performance benefits, as well as ensuring that all disks are visible to the
array.
Fault-tolerant cabling example
The following figure shows an MSA 2050 array connected to two MSA 2050 disk enclosures using fault-
tolerant cabling.
I/O modules A on the disk enclosures are shaded blue. I/O modules B on the disk enclosures are shaded
orange. Fault-tolerant cabling requires that you connect controller A to I/O module A of the first disk enclosure
and cascade this connection on to I/O module A of the last disk enclosure cables (shown in blue). Likewise,
you must connect controller B to I/O module B of the last disk enclosure and cascade this connection on to
I/O module B of the first disk enclosure cables (shown in orange).
1. MSA 2050 array controller
2. MSA 2050 disk enclosure
3. MSA 2050 disk enclosure
Straight-through cabling example
The following figure shows a MSA 2050 array connected to two MSA 2050 disk enclosures using straight-
through cabling.
Straight-through cabling requires that you connect MSA 2050 controller A to I/O module A of the first disk
enclosure which is in turn connected to I/O module A of the last disk enclosure cables (shown in blue). MSA
2050 controller B is connected to I/O module B of the first disk enclosure which is in turn connected to I/O
module B of the last disk enclosure cables (shown in orange).
8 Connecting the MSA 2050 array to expansion disk enclosures
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