Removing and installing a SAS cable

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Use the following procedures to attach SAS cables to the 5U92 enclosure during the initial installation process. You can also remove a faulty SAS cable and replace it with a new one received from FRU stock.

About this task

Be careful when you are replacing the hardware components that are located in the back of the system. Do not inadvertently disturb or remove any cables that you are not instructed to remove.

If you replace more than one cable, record which two ports, canisters, and enclosures each cable connects, so you can match the connections with the replacement cables. The system cannot operate if the SAS cabling to the disk enclosure is incorrect. See the Installing container of the IBM® Knowledge Center for information about the correct SAS cabling for disk enclosures.

When the 5U92 disk enclosure is installed in the rack, the expansion canisters are upside down. The input cables connect to both the left port (port 1), and the left port (port 2) on the expansion canister from the right side of the enclosure when viewed from the rear as shown below.
Note: The two ports on the left hand canister are not used.
Figure 1. Left view of SAS port orientation on disk enclosures
Left view SAS port orientation

Procedure

Removing a SAS cable

  1. Locate the connector at the end of the SAS cable that is to be removed from the expansion enclosure.
  2. Grasp the connector by its blue tag. Pull the tag.
  3. Release the connector and slide it out of the SAS port.
  4. Repeat steps 2 and 3 on the other end of the SAS cable.

Replacing a SAS cable

  1. Ensure that the SAS connector is oriented correctly, as shown in Figure 2. The blue tab must face towards the top of the enclosure canister.
    Figure 2. Correct orientation for SAS cable connectors
    Correct orientation for SAS cable connectors
    •  1  Blue pull tab
    •  2  SAS cable
    •  3  SAS port
  2. Insert the SAS cable into the SAS port until you hear or feel a click. When the cable is successfully inserted, you cannot disconnect the cable without pulling on the blue tag.

Connecting to a system node

  1. Connect the SAS cable to the SAS port with blue tab above the connector (that is, facing towards the top of the node).

    You hear or feel a click when the cable is successfully inserted. You cannot disconnect the cable without pulling on the blue tag.

  2. Route the SAS cables through the cable management arms, as shown in Figure 3.
    Figure 3. Example of SAS cables routed through the cable management arms (NOTE: SAS cables are not installed on the left-hand side of expansion canister for the IBM Cloud Object Storage 5U92 disk enclosure)
    Example of SAS cables routed through the cable management arms
  3. When both ends of a SAS cable are correctly connected, the green link-LED next to the connected SAS ports are lit.

    For example, Figure 4 shows the LEDs of the expansion canister on a 5U92 disk enclosure. The SAS cable is successfully inserted in to port 1.

    Figure 4. SAS cable correctly inserted into the SAS port
    SAS cable correctly inserted into the SAS port