Dell EMC Data Domain FS15 SSD Shelf Hardware Manual page 29

Cable a set that consists of one shelf
Cable a set that contains multiple shelves
Procedure
1. Make a connection from one of the Data Domain system's SAS HBA ports (for
example, HBA 3 Port A) to the shelf's Controller A's host port using a DD
System-to-Shelf cable.
2. Make a second connection from a port on another SAS HBA card (for example,
HBA 2 Port B) to the shelf Controller B's host port using a DD System-to-Shelf
cable.
Note
The port to shelf cabling is different for each controller. Cabling details such
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as HBA port numbers can be found in the system's installation and
configuration guide.
If only one HBA is allowed in a system (such as for the DD2500 system),
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then use another port as defined for that specific system.
Procedure
1. Connect one SAS HBA port (for example, HBA 3 Port A) on the Data Domain
system to the top shelf controller's host port, using a DD System-to-Shelf
cable.
2. Using another HBA card (for example, HBA 2 Port B), connect a SAS port to
the bottom shelf controller's host port, using a DD System-to-Shelf cable.
Whenever you add a shelf to an existing set, remove the SAS HBA cable and
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re-connect it to the current top/bottom shelf. The SAS HBA cables are
always connected to the top and bottom shelves in the set. Add shelves in
the installation order for your controller.
If only one HBA is allowed in a system (such as for the DD2500 system),
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then use another port as defined for that specific system.
Installing the Shelves
Cabling shelves
29