Cisco Nexus 9336PQ Hardware Installation Manual page 26

Attaching the Bottom-Support Rails to the Rack
Before You Begin
Before you can install the bottom support rails for the chassis, you must do the following:
• Verify that a four-post rack or cabinet is installed.
• If any other devices are stored in the rack or cabinet, verify that the heavier switches are installed below
• Verify that the bottom-support rails kit is included in the switch accessory kit.
• Verify that you have 8 screws for attaching the bottom support brackets to the racks (typically M6 x 10
Warning Statement 1006—Chassis Warning for Rack-Mounting and Servicing
To prevent bodily injury when mounting or servicing this unit in a rack, you must take special precautions
to ensure that the system remains stable. The following guidelines are provided to ensure your safety:
• This unit should be mounted at the bottom of the rack if it is the only unit in the rack.
• When mounting this unit in a partially filled rack, load the rack from the bottom to the top with
• If the rack is provided with stabilizing devices, install the stabilizers before mounting or servicing
Step 1 Look at the fan and power supply modules installed in the chassis to determine how you must position the bottom-support
rails on the rack.
• If the fan modules have blue coloring (port-side exhaust modules), you must position the bottom support rails so
that the chassis stop is positioned by the cold aisle.
• If the fan modules have burgundy (port-side intake modules), you must position the bottom support rails so that
the chassis stop is positioned by the hot aisle.
Step 2 Separate the two sliders that make up one bottom-support rail and position the half with the chassis stop by the appropriate
aisle for the fan and power supply modules. Also make sure that there is at least rack units open above the bottom-support
rails so that you can easily install the chassis.
Step 3 Use two customer-supplied screws (typically M6 x 10 mm screws) to attach the bottom-support rail half to the vertical
mounting rails on the rack post. Tighten each screw to the appropriate torque setting for the screws (for M6 x 10 mm
screws, use 40 in. lbs [4.5 N·m] of torque).
Step 4 Slide the other half of the bottom-support rail onto the attached half of the rail set and use two customer supplied screws
(typically M6 x 10 mm screws) to secure that portion to the vertical mounting rails on the rack. Tighten each screw to
the appropriate torque setting for the screws (for M6 x 10 mm screws, use 40 in. lbs [4.5 N·m] of torque).
Step 5 Repeat Steps 2 and 3 to attach the other expanding bottom-support rails to the other side of the rack.
Check the two installed bottom support rails to be sure that both have their chassis stops by the same aisle (either
Note
both by the hot aisle or both by the cold aisle) and that both rails are level and level with each other. If they are
not level, adjust the higher rail down to the level of the lower rail.
Cisco Nexus 9336PQ ACI-Mode Switch Hardware Installation Guide
16
lighter switches and that there is at least rack units open to install the switch.
mm screws or the screw appropriate for the vertical mounting rails on the rack.
the heaviest component at the bottom of the rack.
the unit in the rack.
Installing the Chassis