Lenovo DM120S, Installation And Cabling Manual, Page: 18 / 70

If... Then...
You are cabling a stack with multipath HA,
multipath, single-path HA, or single-path
connectivity to the controllers Cable the shelf-to-shelf connections as
“standard” connectivity (using IOM ports 3 and 1):
i. Beginning with the logical first shelf in the stack,
connect IOM A port 3 to the next shelf's IOM A
port 1 until each IOM A in the stack is connected.
ii. Repeat substep i for IOM B.
You are cabling a stack with quad-path HA or
quad-path connectivity to the controllers Cable the shelf-to-shelf connections as “double-
wide” connectivity:
You cable the standard connectivity using IOM
ports 3 and 1 and then the double-wide
connectivity using IOM ports 4 and 2.
i. Beginning with the logical first shelf in the stack,
connect IOM A port 3 to the next shelf's IOM A
port 1 until each IOM A in the stack is connected.
ii. Beginning with the logical first shelf in the stack,
connect IOM A port 4 to the next shelf's IOM A
port 2 until each IOM A in the stack is connected.
iii. Repeat substeps i and ii for IOM B.
b. Check the controller-to-stack cabling worksheets and cabling examples sections to see
whether a completed worksheet exists for your configuration.
c. If there is a completed worksheet for your configuration, cable the controller-to-stack
connections using the completed worksheet; otherwise, go to the next substep.
d. If there is no completed worksheet for your configuration, fill out a worksheet template, and
then cable the controller-to-stack connections using the completed worksheet.Worksheet
templates can be found towards the back of this guide.
e. Verify that all cables are securely fastened.
Step 3. If you are hot-adding one or more disk shelves to an end—the logical first or last disk shelf—of an
existing stack, complete the applicable substeps for your configuration; otherwise, go to the next
step.
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Installation and Cabling Guide for DM120S, DM240S, and DM600S