Dell EMC Unity Series Field Upgrade Procedure page 36

Field Upgrade Procedure
Unity All Flash and Unity Hybrid Field Upgrade Procedure
36
Note
x8 connections can only be made using the 4-port back-end SAS I/O module. Never
use ports 1 and 2 for x8 connections.
Procedure
Connect to the 4-port SAS back-end I/O module: Insert SAS cables into ports 0
l
and 1 or ports 2 and 3 of the 4-port SAS I/O modules in the storage processor, if
they are not connected already. For consistency and clarity, use ports 0 and 1 first.
This will create BE bus 2. The next configured x8 bus using ports 2 and 3 will
create BE 4.
a. Label a pair of mini-SAS HD cables using the black or green labels.
The labels used depend upon how the back-end ports are configured.
b. Connect the ports as follows:
Ensure that the SAS cable is inserted into ports 0 and 1 or ports 2 and 3 of
n
the SP A SAS module, located in the bottom storage processor of the DPE.
Connect the cable to ports AA/A of link control card A (LCC A), located on
the right side of the DAE.
Ensure that the SAS cable is inserted into ports 0 and 1 or ports 2 and 3 of
n
SP B SAS module, located in the top storage processor of the DPE.
Connect the cable to ports AA/A of link control card B (LCC B), located on
the left side of the DAE.