◦
You can use these cables for controller-to-stack and shelf-to-shelf connections.
◦
The length of a single cable cannot exceed 150 meters for OM4 and 100 meters for OM3.
◦
The total end-to-end path (sum of point-to-point paths from the controller to the last shelf)
cannot exceed 510 meters.
The total path includes the set of breakout cables, patch panels, and inter-panel cables.
•
If you are using SAS optical multimode breakout cables, 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 a shelf-to-shelf connection, you can only use it
once within a stack of disk shelves. You must use SAS optical multimode QSFP-to-QSFP
or MPO cables with MPO QSFP modules to connect the remaining shelf-to-shelf
connections.
◦
The point-to-point (QSFP-to-QSFP) path of any multimode cable cannot exceed 150
meters for OM4 and 100 meters for OM3.
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 510 meters.
The total path includes the set of breakout cables, patch panels, and inter-panel cables.
◦
Up to one pair of patch panels can be used in a path.
◦
You need to supply the patch panels and inter-panel cables.
The inter-panel cables must be the same mode as the SAS optical breakout cable:
multimode.
◦
You received a set of QSFP-to-MPO cable modules with each set of SAS optical breakout
cables, which you must attach to the MPO end of each SAS optical breakout cable.
The breakout cables have SC, LC, or MTRJ connectors on the opposite end, which connect
to a patch panel.
◦
You must connect all eight (four pairs) of the SC, LC, or MTRJ breakout connectors to the
patch panel.
Installing a disk shelf for a hot-add
Installing the new disk shelf involves installing the disk shelf in a rack using the applicable two-
post telco tray kit or the four-post rail kit, setting the disk shelf ID, and enabling ACP if you will
be using ACP capability on your storage system for the first time.
Steps
1. Properly ground yourself.
2. Install the two-post telco tray kit or the four-post rail kit for your disk shelf model using the
installation flyer that came with the kit.
Attention: If you are installing multiple disk shelves,
you should install them from the bottom to the top of
the rack for the best stability.
Do not ear-mount the disk shelf into a telco-type
rack; the disk shelf's weight will cause it to collapse
in the rack under its own weight.
DS4243, DS2246, DS4486, and DS4246 Installation and Service Guide
13
Hot-adding a SAS disk shelf
