Seagate Exos E 4U106 Hardware Installation And Maintenance Manual page 62

SAS Expansion
As you face the rear panel of the 4U106 enclosure, the left IOM slot is 1 and the right IOM slot is 0. See also
Figure 5 (page 19)
and blue is used to show IOM 1 paths for cabling the expansion enclosures shown in each cascade.
Figure 56 Cabling the 4U106 enclosures to the storage system (1 of 2)
The diagram on the left shows the daisy chain cabling method and the diagram on the right shows the star cabling
method.
An advantage of the star configuration is that each expansion enclosure is only one additional expander or "hop"
away from the initiator. This reduces delays in the SAS communication path. Those effects are small by measure.
However, there are a limited number of expansion ports, so for larger topologies, some combination of the two
approaches will be required.
SAS ports connected.
62 Installation
for FRU slot index numbering for the enclosure rear panel. Green is used to show IOM 0 paths
4U106 enclosure
4U106 enclosure
4U106 enclosure
4U106 enclosure
Daisy chain cabling method
Figure 57 (page 63)
To HBA
provides another daisy chain cabling example with all 12Gb/s
4U106 enclosure
4U106 enclosure
4U106 enclosure
4U106 enclosure
Star cabling method
To HBA