IBM FlashSystem 5000 Series, Quick Installation Manual

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Note: When you connect SAS cables between enclosures, review and follow the guidelines to ensure that
your configuration is valid. Do not begin connecting the cables until you read “SAS cabling guidelines” on
page 63.
Procedure
To install the cables, complete the following steps.
SAS cabling guidelines
When you connect SAS cables between expansion enclosures, you must follow guidelines to ensure that
your configuration is valid.
Orienting the connector
When you insert SAS cables, make sure the connector (Figure 62 on page 63) 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.
• 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 be removed only 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 62. SAS cable connectors
Guidelines
Be aware of the following guidelines when you attach the cables to the SAS ports.
Connecting SAS cables
Be aware of the following guidelines when you attach the cables to the SAS ports in 2U expansion
enclosures.
• No more than 10 expansion enclosures can be chained to SAS port 1 of a node canister. The expansion
enclosures in this chain must be installed below the control enclosure.
• For systems:
– No more than 10 expansion enclosures can be chained to SAS port 2 of a node canister. The
expansion enclosures in this chain must be installed above the control enclosure.
Chapter 4. Installing the system hardware 63