Sas Cabling Guidelines; Sas Cable Connectors - Lenovo Storage V7000 Quick Installation Manual

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 "SAS cable connectors" on page 23) is
oriented correctly.
• 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.
• The blue pull tab must be below the connector.
• 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.
• When inserted correctly, the connector can only be removed by pulling the tab.
• 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 attach the cables to the SAS ports.
• 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
"Connecting the SAS cables" on page 24).
• 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
"Connecting the SAS cables" on page 24).
• No cable can be connected between a port on a left canister and a port on a right canister.
• A cable must not be connected between ports in the same enclosure.
• 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.
• Attach cables serially between enclosures; do not skip an enclosure.
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Chapter 2 Installing the Lenovo Storage V7000 hardware
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