Cisco UCS 5108 Server Chassis Installation Guide
Installing and Removing Components
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Installing and Removing Components

Installing and Removing Components

This chapter describes how to remove components from the chassis and how to install components into the chassis. This section contains the following section:


The following figure shows an empty Cisco UCS 5108 server chassis and identifies the front, back, and module slots.


Whenever you remove a module from the chassis for an extended period of time, always replace the module with the appropriate blank panel. Failing to do so can result in heating and EMI issues. Blank panels can be ordered from Cisco Systems.

Figure 1. View of Cisco UCS 5108 Server Chassis


Front of chassis


Power supply slot (4 slots)


Chassis handle


Fabric interconnect or FEX slot (2 slots)


Rear of chassis


Fan slots (8 slots)


Half-width server slot (8 slots)


Power Distribution Unit (PDU) slot


Before you install, operate, or service the system, see the Regulatory Compliance and Safety Information for Cisco UCS for important safety information.



This warning symbol means danger. You are in a situation that could cause bodily injury. Before you work on any equipment, be aware of the hazards involved with electrical circuitry and be familiar with standard practices for preventing accidents. Use the statement number provided at the end of each warning to locate its translation in the translated safety warnings that accompanied this device. 
Statement 1071



This unit is intended for installation in restricted access areas. A restricted access area can be accessed only through the use of a special tool, lock and key, or other means of security. 
Statement 1017


Only trained and qualified personnel must be allowed to install, replace, or service this equipment. Statement 1030

Installing and Removing a Blade Server

There are two types of blade server supported, half-width and full-width. Their installation is similar but with important differences. For details, see the Blade Server Installation and Service Note for the type of blade server you are using. The server notes are available at the following URL: http:/​/​​en/​US/​products/​ps10280/​prod_​installation_​guides_​list.html

Installing and Removing a Blade Server Hard Drive

You can remove blade server hard drives without removing the blade server from the chassis. All other component replacement for a blade server requires removing the blade from the chassis. Unused hard drive bays should always be covered with cover plates (N20-BBLKD) to assure proper cooling and ventilation. The chassis is omitted from illustrations here to simplify the drawing.


To prevent ESD damage, wear grounding wrist straps during these procedures and handle modules by the carrier edges only.

Installing a Blade Server Hard Drive

    Step 1   Place the hard drive lever into the open position by pushing the release button.
    Step 2   Gently slide the hard drive into the opening in the blade server until it seats into place.
    Step 3   Push the hard drive lever into the closed position.

    The following figure shows the positioning of a hard drive within a blade server.

    Figure 2. Positioning a Hard Drive in a Blade Server (Cisco UCS B200 M1 shown)

    Removing a Blade Server Hard Drive

      Step 1   Push the button to release the ejector, and then pull the hard drive from its slot.
      Figure 3. Pressing the Button on the Front of the Hard Drive to Deploy the Lever (Cisco UCS B200 M1 shown)


      Release button


      Hard drive lever

      Step 2   Place the hard drive on an antistatic mat or antistatic foam if you are not immediately reinstalling it in another blade server.
      Step 3   Install a blank faceplate (N20-BBLKD) to keep dust out of the blade server if the slot will remain empty.

      Installing and Removing Power Supplies


      The AC and DC power supplies are keyed to work only with the power distribution system in their respective chassis version. Mixing AC and DC in a given chassis is not supported.

      Installing a Power Supply

      All power supply models (N20-PAC5-2500W, UCSB-PSU-2500ACPL, or UCSB-PSU-2500DC48) install using the same process.

        Step 1   Place the power supply’s handle in the up position.
        Step 2   Hold the power supply with both hands, and then slide it into the power supply bay,
        Step 3   Press the handle down, and give the power supply a gentle push inward to ensure that the power supply is fully seated into the Power Distribution Unit (PDU).
        Step 4   Tighten the captive screw.
        Step 5   For an AC installation, plug the power cable into the corresponding 220 VAC–inlet connector on the PDU at the rear of the chassis. For a DC environment, see Connecting a DC Power Supply.

        Depending on the outlet receptacle on your rack’s power distribution unit, you may need the optional jumper power cord to connect the Cisco UCS 5108 server chassis to an outlet receptacle.

        Step 6   Connect the other end of the power cable to the AC–power source.
        Step 7   Verify the power supply is operating by checking the power supply LEDs. See LED Locations and Interpreting LEDs.
        Figure 4. Positioning a Power Supply in the Cisco UCS Server Chassis


        Both grids in a power redundant system should have the same number of power supplies. If your system is configured for grid redundancy, slots 1 and 2 are assigned to grid 1 and slots 3 and 4 are assigned to grid 2. If there are only two power supplies in a redundant- mode chassis, they should be in slots 1 and 3. This would be a very unusual configuration, with a single B200 blade server in the chassis. A larger configuration would require two power supplies per grid. Slot and cord connection numbering is shown below.

        Figure 5. Power Supply Bay and Connector Numbering (AC Version Shown)

        Removing a Power Supply


        If you are using the Cisco UCS 5108 server chassis with one power supply (this is only supported in earlier versions of the system software), removing the power supply will cause the servers and chassis to shut down. If you are using more than two power supplies, and you remove one of them, the servers continue to operate as long as the other power supplies are sufficient to meet the power requirements of the number of servers in the chassis.

          Step 1   Loosen the captive screw on the front of the power supply.
          Step 2   Lift up the power supply’s handle to unseat the power supply.
          Step 3   Using the lever, pull the power supply from its slot. Place your other hand under the power supply to support it while you slide it out of the chassis.
          Step 4   Install a blank power supply filler panel (N20-CBLKP) if the power supply bay is to remain empty.

          Installing and Removing a Power Distribution Unit (PDU)


          The Power Distribution Unit should only be replaced by a Cisco certified technician. This section is for reference only.


          You can not hot swap a PDU (N01-UAC1). The entire chassis will need to be shut down and all power cords should be unplugged before attempting this procedure.

          Installing a PDU

            Step 1   Hold the PDU module from below, with the captive screws at the top of the module.
            Figure 6. Positioning a PDU (N01-UAC1) in the Cisco UCS Server Chassis, AC Version

            Step 2   Push the PDU module into the chassis until it seats properly. If power supplies are installed, you may need to partially remove them.
            Step 3   Tighten the captive screws.
            Step 4   If necessary, reseat the power supplies and restart the system to observe LED behavior.

            Removing a PDU

              Step 1   Partially remove all installed power supplies. If a power supply is seated into the PDU, removal is difficult or impossible.
              Step 2   Loosen the captive screws.
              Step 3   Pull the PDU clear of the chassis by pulling on the captive screws. Support its weight from below.

              Installing and Removing a FEX or Fabric Interconnect

              The chassis houses two FEXes (Cisco UCS 2104XP, UCS 2208XP, UCS 2204XP) that allow the blade servers in the chassis to communicate with Cisco UCS fabric interconnects. FEXes can have either four or eight I/O ports.

              The same slot that is used for a FEX is used for the Cisco UCS 6324 Fabric Interconnect. Up to two of these modules can be installed in the chassis.


              A FEX is sometimes referred to as an “I/OM” or IO Module.

              FEX Upgrade Considerations

              Before you install a pair of UCS 2208XP FEXes to an existing UCS chassis using a pair of UCS 2104XPs, or add a new chassis with a pair of UCS 2208XP FEXes to a UCS instance you must perform a full upgrade to UCS software version 2.0(1) or later. The UCS 2208XP FEX is not recognized by earlier software releases.

              Before you install a pair of UCS 2204XP FEXes to an existing UCS chassis using a pair of UCS 2104XPs, or add a new chassis with a pair of UCS 2204XP FEXes to a UCS instance you must perform a full upgrade to UCS software version 2.0(2) or later. The UCS 2204XP I/O Module is not recognized by earlier software releases.

              Upgrading from a pair of UCS 2104XP to a pair of UCS 2200 series modules should be done first on the FEX connected to the standby Fabric Interconnect, standby should be made active, then the FEX connected to the new standby Fabric Interconnect can be upgraded.

              If you are also performing an upgrade on the fabric interconnects, perform the upgrades separately. Attempting to upgrade both FEXes and fabric interconnects in a single process will likely complicate any reconfiguration needed on the FI ports.

              Adding any M3 model blade server may require an upgrade from UCS 2104XP to UCS 2208 series FEXes. M3 blade servers use newer MLOM and adapter card models that are not fully compatible with the older FEX model.

              Before you disconnect any data cables, make a record of which FEX ports are connected to which Fabric interconnect ports.

              Configurations of 1, 2, 4, or 8 10 GB connections between FEX and Fabric interconnect are supported in UCS. If your UCS 2104XP has 4 physical connections and you want more, the next available upgrade step is the full 8 connections on the UCS 2208XP. You should verify that the FEX upgrade is completed with no problems before adding the connections for ports 5-8.

              If you intend to implement the Fabric port channel feature available in UCS software version 2.0, you may need to rearrange the cabling between FEX and Fabric Interconnect before performing the feature configuration. Fabric port channel will require that all physical links from a given FEX physically connect to a contiguous block of ports (1 to 8 or 9 to 16, and so on). This feature requires a Cisco UCS M82-8P Virtual Interface Card in at least one blade server, and a UCS 2200 Series I/O module that is connected to a UCS 6200 Series Fabric Interconnect. See the Fabric Port Channel sections in the configuration guides for more details.

              Removing a FEX or UCS 6324 Fabric Interconnect

                Step 1   Remove all cables from the FEX or UCS 6324 Fabric Interconnect.
                Step 2   Loosen the captive screws on the FEX or UCS 6324 Fabric Interconnect.
                Step 3   Pull the levers outward to unseat the FEX or UCS 6324 Fabric Interconnect.
                Step 4   Using the levers, pull the FEX or UCS 6324 Fabric Interconnect from its slot.
                Step 5   Install a blank FEX filler panel (N20-CBLKI) if the FEX or fabric interconnect slot is to remain empty.

                If you plan to remove a FEX or fabric interconnect for an extended period of time, you must replace it with the N20-CBLKI blank to avoid EMI issues. Blanks can be order from Cisco.

                Installing a FEX or Fabric Interconnect

                  Step 1   Make sure that the two levers at the front of the FEX or the UCS 6324 Fabric Interconnect are pulled open.
                  Step 2   Slide the FEX or UCS 6324 Fabric Interconnect into the chassis slot, ensuring that the module is fully seated.
                  Figure 7. Positioning a FEX or Fabric Interconnect within the Server Chassis

                  Step 3   Close the levers and tighten the captive screw on each lever.
                  Step 4   Connect the networking cables (see SFP+ Transceivers and Proper FEX and Fabric Interconnect Port Connectivity ).
                  Step 5   Verify that the module is functioning correctly. See LED Locations and Interpreting LEDs.

                  Installing and Removing a Fan Module

                  You can hot swap a fan module (N20-FAN5) without causing an electrical hazard or damage to the system. However, you can only remove one fan module while the system is operating. Removing more than one fan module could cause overheating.


                  When a fan is removed, louvers inside the chassis prevent recirculation of air into the system or loss of cooling. However, you should not leave the chassis for extended periods of time without all fan modules in place.

                  Installing a Fan Module

                    Step 1   Hold the fan module with the spring latch at the top of the module.
                    Step 2   Push the fan module into the chassis until it seats properly and the spring latch snaps into place.
                    Step 3   Listen for the fans if the chassis is powered on. You should immediately hear it operating. If you do not hear it, ensure that the fan module is inserted completely in the chassis and the faceplate is flush with the outside surface of the chassis.
                    Step 4   Verify that the LED behavior is as expected. See LED Locations and Interpreting LEDs.
                    Figure 8. Positioning a Fan Module (N20-FAN5) in the Cisco UCS Server Chassis

                    Removing a Fan Module

                      Step 1   Hold the fan module by its handle.
                      Step 2   Press down on the spring latch at the top of the fan module.
                      Step 3   Pull the fan module clear of the chassis.

                      The chassis is designed to have all fan modules in place and operating at all times. Do not leave a fan module bay empty for longer than is necessary to replace it with a new fan module.