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SAS cabling guidelines
When connecting SAS cables between enclosures, you must follow a list of
guidelines to ensure that your configuration is valid.
Orienting the connector
When inserting SAS cables, make sure the connector (Figure 21) is oriented
correctly.
v The orientation of the connector must match the orientation of the port before
you push the connector into the port. The cable connector and socket are keyed,
and it is important that you have proper alignment of the keys when the cable is
inserted.
v The blue pull tab must be below the connector.
v Insert the connector gently until it clicks into place. If you feel resistance, the
connector is probably oriented the wrong way. Do not force it.
v When inserted correctly, the connector can only be removed by pulling the tab.
v When both ends of a SAS cable are inserted correctly, the green link LEDs next
to the connected SAS ports are lit.
Figure 21. SAS cable connectors
Guidelines
Be aware of the following guidelines when you begin to attach the cables to the
SAS ports.
v No more than ten expansion enclosures can be chained to SAS port 1 of a node
canister. The expansion enclosures in this chain should be installed below the
control enclosure (as shown in Figure 22 on page 24).
v No more than ten expansion enclosures can be chained to SAS port 2 of a node
canister. The expansion enclosures in this chain should be installed above the
control enclosure (as shown in Figure 22 on page 24).
v No cable can be connected between a port on a left canister and a port on a
right canister.
v A cable must not be connected between ports in the same enclosure.
v A connected port on the node canister must connect to a single port on an
expansion canister. Cables that split the connector out into separate physical
connections are not supported.
Chapter 2. Installing the hardware
23
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