|SAS cabling rules|
Mini-SAS HD SAS optical cable rules
You can use mini-SAS HD SAS optical cables—multimode active optical cable (AOC) cables with mini-SAS HD-to-
mini-SAS HD connectors and multimode (OM4) breakout cables with mini-SAS HD-to-LC connectors—to achieve
long distance SAS connectivity for certain configurations that have disk shelves with IOM12 modules.
• Your platform and version of ETERNUS AX/HX Series must support the use of mini-SAS HD SAS optical
cables: multimode active optical cable (AOC) cables with mini-SAS HD-to-mini-SAS HD connectors and
multimode (OM4) breakout cables with mini-SAS HD-to-LC connectors.
• SAS optical multimode AOC cables with mini-SAS HD-to-mini-SAS HD connectors can be used for controller-
to-stack and shelf-to-shelf connections, and are available in lengths up to 50 meters.
• If you are using SAS optical multimode (OM4) breakout cables with mini-SAS HD-to-LC connectors (for
patch panels), the following rules apply:
• You can use these cables for controller-to-stack and shelf-to-shelf connections.
If you use multimode breakout cables for shelf-to-shelf connections, you can only use them once within
a stack of disk shelves. You must use multimode AOC cables to connect the remaining shelf-to-shelf
connections.
For quad-path HA and quad-path configurations, if you use multimode breakout cables for the shelf-to-
shelf double-wide connections between two disk shelves, the best practice is to use identically paired
breakout cables.
• You must connect all eight (four pairs) of the LC breakout connectors to the patch panel.
• You need to supply the patch panels and inter-panel cables.
The inter-panel cables must be the same mode as the breakout cable: OM4 multimode.
• Up to one pair of patch panels can be used in a path.
• The point-to-point (mini-SAS HD-to-mini-SAS HD) path of any multimode cable cannot exceed 100
meters.
The path includes the set of breakout cables, patch panels, and inter-panel cables.
• The total end-to-end path (sum of point-to-point paths from the controller to the last shelf) cannot
exceed 300 meters.
The total path includes the set of breakout cables, patch panels, and inter-panel cables.
• The SAS cables can be SAS copper, SAS optical, or a mix.
If you are using a mix of SAS copper cables and SAS optical cables, the following rules apply:
• Shelf-to-shelf connections in a stack must be all SAS copper cables or all SAS optical cables.
• If the shelf-to-shelf connections are SAS optical cables, the controller-to-stack connections to that stack
must also be SAS optical cables.
• If the shelf-to-shelf connections are SAS copper cables, the controller-to-stack connections to that stack
can be SAS optical cables or SAS copper cables.
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