Lenovo DM120S Service Manual page 44

• The IOM12 modules are arranged side-by-side as in a DM240S or DM120S disk shelf; if you
have a DM600S, the IOM12 modules are arranged one above the other.
• The stack in each example is cabled with standard shelf-to-shelf cabling, which is used in stacks
cabled with multipath HA or multipath connectivity.You can infer the recabling if your stack is
cabled with quad-path HA or quad-path connectivity, which uses double-wide shelf-to-shelf
cabling.
• The cabling examples demonstrate recabling one of the paths: path A (IOM A).You repeat the
recabling for path B (IOM B).
• The cabling example for removing a disk shelf from the end of a stack demonstrates removing
the logical last disk shelf in a stack that is cabled with multipath HA connectivity.You can infer
the recabling if you are removing the logical first disk shelf in a stack or if your stack has
multipath connectivity.
Step 6. Verify that you bypassed the disk shelves you are removing and reestablished the path A (IOM A)
stack connections correctly: storage disk show -port
For HA pair configurations, you run this command from the clustershell of either controller. It might
take up to a minute for the system to complete discovery.
Example
The first two lines of output show disk drives with connectivity through both path A and path B. The
last two lines of output show disk drives with connectivity through a single-path, path B.
cluster::> storage show disk -port
PRIMARY PORT SECONDARY
-------- ---- ---------
1.20.0 A node1:6a.20.0 B
1.20.1 A node1:6a.20.1 B
1.21.0 B -
1.21.1 B -
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Service Guide for DM120S, DM240S, and DM600S
PORT TYPE SHELF BAY
---- ---- ----- ---
SAS 20 0
SAS 20 1
- SAS 21 0
- SAS 21 1