4.1.1 Reviewing the PDU Replacement Guidelines

Before replacing a PDU, review the following guidelines to ensure the procedure is safe and does not disrupt availability.

• Unlatching the RDMA Network Fabric cables while removing or inserting PDU-A may cause a loss of service due to nodes being removed from the cluster. This could cause the rack to be unavailable. Care should be taken when handling the RDMA Network Fabric cables, which are normally latched securely. Do not place excessive tension on the RDMA Network Fabric cables by pulling them.

• Unhooking the wrong power feeds causes the rack to shut down. Trace the power cables running from the PDU that will be replaced to the power source, and only unplug those feeds.

• Allow time to unpack and repack the PDU replacement parts. Note how the power cords are coiled in the packaging so the failed unit can be repacked the same way.

• Removal of the side panel lessens the amount of time needed to replace the PDU. However, it is not necessary to remove the side panel to replace the PDU.

• Use of a cordless drill or power screwdriver lessens the amount of time needed to replace the PDU. Allow more time for the replacement if using the hand wrench tool provided with the replacement rack. If using a screwdriver, then ensure that there are Torx T30 and T25 bits.

• It may be necessary to remove the server cable arms to move the power cables. If that is the case, then twist the plug connection and flex the cable arm connector to avoid having to unclip the cable arm. If it is necessary to unclip the cable arm, then support the cables with one hand, remove the power cord, and then clip the cable arm. Do not leave the cable arm hanging.

• When removing the T30 screws from the L-bracket, do not remove the T25 screws or nuts that attach the PDU to the bracket until the PDU is out of the rack.