
Controller A and C port connection rules (for non DM3000x, DM5000x, or DM7000x configurations)
• A and C ports are always the primary paths to a stack.
• A and C ports always connect to the logical first disk shelf in a stack.
• A and C ports always connect to disk shelf IOM ports 1 and 2. IOM port 2 is only used for quad-path HA
and quad-path configurations.
• Controller 1 A and C ports always connect to IOM A (domain A).
• Controller 2 A and C ports always connect to IOM B (domain B).
The following illustration highlights how controller ports A and C connect in a multipath HA configuration with
one quad-port HBA and two stacks of disk shelves. Connections to stack 1 are shown in blue. Connections
to stack 2 are shown in orange.
Controller B and D port connection rules (for non DM3000x, DM5000x, or DM7000x configurations)
• B and D ports are always the secondary paths to a stack.
• B and D ports always connect to the logical last disk shelf in a stack.
• B and D ports always connect to disk shelf IOM ports 3 and 4.IOM port 4 is only used for quad-path HA
and quad-path configurations.
• Controller 1 B and D ports always connect to IOM B (domain B).
• Controller 2 B and D ports always connect to IOM A (domain A).
• B and D ports are connected to the stacks by offsetting the order of the PCI slots by one so that the first
port on the first slot is cabled last.
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Installation and Cabling Guide for DM120S, DM240S, and DM600S
Summary of Contents for DM120S
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