and a single transition is maintained through the stack and onboard IOM12E storage.
• Only a single speed transition is supported in a mixed stack. You cannot have additional speed transitions.
For example, you cannot have two speed transitions within a stack, which is depicted as:
Controller <-> IOM6 <-> IOM6 <---> IOM12 <-> IOM12 <---> IOM6 <->
Controller
• You can hot-add IOM6 shelves to a mixed stack. However, you must hot-add them to the side of the stack
with the IOM6 shelves (existing group of IOM6 shelves) in order to maintain the single speed transition in
the stack.
• You cable IOM12 shelves by connecting the SAS ports on the IOM A path first, and then repeat the cabling
steps for the IOM B path, as applicable to your stack connectivity.
In a MetroCluster configuration, you cannot use the IOM B path.
• The initial IOM12 shelf (the IOM12 shelf connecting to the logical last IOM6 shelf) always connects to the
IOM6 shelf circle ports (not square ports).
• The SAS cable connectors are keyed; when oriented correctly into a SAS port, the connector clicks into
place.
For shelves, you insert a SAS cable connector with the pull tab oriented down (on the underside of the
connector). For controllers, the orientation of SAS ports can vary depending on the platform model;
therefore, the correct orientation of the SAS cable connector varies.
• You can reference the following illustration for cabling IOM12 shelves to an IOM6 shelf stack in a
configuration that is not using FC-to-SAS bridges.
This illustration is specific to a stack with multipath HA connectivity; however, the cabling concept can be
applied to stacks with multipath, single-path HA, single-path connectivity, and stretch MetroCluster
configurations.
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