Reseating a node canister in the control enclosure

To access or replace some components during service procedures, a node canister might need to be removed from, and reseated into, the control enclosure.

About this task

Note: This topic provides instructions for removing and replacing (reseating) a node canister and should be used only when instructed to do so by other service procedures.

To replace a faulty node canister with one from FRU stock, follow the procedure that is described in Removing and replacing a faulty node canister.

Keep these items in mind when you do this task:
  • No tools are required to complete this task. Do not remove or loosen any screws.
  • Before a node canister can be removed, it must be powered off or be in service state; otherwise, loss of data or loss of access to data can result.
  • If a node canister was recently removed from the system and then added again, ensure that the node canister is online for at least 25 minutes before you remove its partner node canister. This delay allows multipath drivers to fail over to the online canister when the partner node canister is removed.
  • Use care when you remove a node canister from the enclosure. The node canister is long and its center of gravity is far forward. It can be helpful to have a lift or other sturdy, flat surface ready to receive the node canister during removal.
  • Use care when you lift and insert a new node canister from FRU stock.
    CAUTION:
    This part or unit is heavy but has a weight smaller than 18 kg (39.7 lb). Use care when lifting, removing, or installing this part or unit. (C008)

Procedure

  1. Shut down the node by using the service assistant. Follow the steps in Procedure: Powering off a node canister.
  2. Use the LED indicators on the node canister to confirm that it is safe to remove it from the enclosure, as described in Procedure: Understanding the system status from the LEDs.
  3. Record which data cables are plugged into the specific ports on the rear of the node canister. The cables must be inserted back into the same ports after the replacement is complete; otherwise, the system cannot function properly.
  4. Disconnect the data cables that are connected to the node canister.

Removing the node canister

  1. Locate the left and right release levers for the node canister.
    On the upper node canister, the release levers are at the top of the control enclosure. For the bottom node canister, the release levers are at the bottom of the enclosure. The release lever is labeled with the serial number of the node canister to help with identification; see Figure 4 for an example.
  2. Pull the left and right levers by the blue ends so that they both unlatch and swing outwards, as shown in Figure 1.
    Figure 1. Removing the bottom node canister
    Removing the node canister
  3. Use the release levels to slowly pull the node canister and partially extract it from the enclosure.
    Warning: The node canister is long and heavy. Figure 2 shows the bottom node canister that is partially extracted from the control enclosure. You might require the use of a lifting platform or other nearby surface to service the node canister. Observe safe handling practices as you complete the following steps:
    Figure 2. Removing the bottom node canister
    Removing the bottom canister
  4. Hold the node canister by its sides so that it is level and its weight is balanced. Then, slide the node canister out of the control enclosure.
  5. Place the node canister on a flat, level surface for servicing, with its lid facing up.
    Note: The top node canister is inverted, as Figure 3 shows. After you remove the top node canister, you must turn it over before you can remove the cover and access its components.
    Figure 3. Removing the top node canister
    Removing the top canister

Replacing the node canister

  1. Ensure that both of the canister release levers are in the open position, as shown in Figure 4.
    Figure 4. Inserting the node canister
    Inserting the node canister
  2. Push the node canister into the enclosure, ensuring that both release levers engage with the canister and begin to close.
  3. Press the release levers closed to fully engage the canister into the enclosure. Press the latch ends to ensure that the latches are engaged with the control enclosure.
  4. Reconnect all cables that were removed from the back of the node canister.
  5. Power on the node canister.
    If the canister does not begin to power up, check that it is fully inserted into the enclosure. If necessary, remove the power and cables; then, repeat steps 10 through 12.