1. Owner's Guide
  2. Security and Maintenance of Recovery Appliance
  3. Maintaining the Recovery Appliance Hardware
  4. Replacing a Power Distribution Unit
  5. PDU Replacement Guidelines

PDU Replacement Guidelines

Before replacing a PDU, review the following guidelines to ensure that you can perform the procedure safely and without disrupting availability:

  • Unlatching the InfiniBand cables while removing or inserting PDU-A might remove servers from the cluster and thus make the rack unavailable. Be careful when handling the InfiniBand cables, which are normally latched securely. Do not place excessive tension on the InfiniBand cables by pulling them.

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

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

  • Removing the side panel decreases the time needed to replace the PDU. However, removing the side panel is optional.

  • Using a cordless drill or power screwdriver decreases the time needed to replace the PDU. Allow more time for the replacement if you use a hand wrench. A screwdriver requires Torx T30 and T25 bits.

  • You might need to remove the server cable arms to move the power cables. In that case, twist the plug connection and flex the cable arm connector, to avoid having to unclip the cable arm. If you must 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 you remove 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.