Installing the Disk Enclosure

About this task

Enclosure installation involves interrelated steps and product-kit sub-assemblies. The rail kit comprises left and right rail sub-assemblies that attach to the Disk Enclosure and the rack. The cable management arm (CMA) comprises sub-assemblies that attach to the Disk Enclosure, rails, and rack.

Warning: Do not attempt to install the enclosure into the rack with disks preloaded into drive slots. Unload disks (if installed) to a static-protected area and label them. Failure to heed this Warning and the following guidelines could result in serious injury. Although you can further lighten the enclosure by removing CRUs, It is not necessary to do so.

This procedure describes adjustment and installation of left and right rail sub-assemblies, followed by installing the Disk Enclosure into the rack.

Procedure

Measure the rail-span depth distance from rear rack post to front rack post, and record this dimension.
Take the left outer rail subassembly in hand; then rotate the middle slide release, and fully extend the middle slide.
Unscrew and remove the quantity-4 rail kit rear-mounting bracket screws to adjust the rack post-to-post distance for the left rail subassembly.
Relocate the left rail mounting bracket to approximately match the rack post-to-post distance recorded in Step 1, above.

This bracket has one inch of available adjustment after the screws are secured. After torquing the quantity-4 screws removed in Step 3, verify that the bracket can be adjusted to the exact rack post-to-post distance determined in Step 1. Torque to 1.36 N-m (12 lbf-in)
Repeat Step 1 through Step 4 for the right outer rail subassembly.
Take the right outer rail subassembly in hand, and flip it over (rotate it 180º along its longitudinal axis).
Using the quantity-4 panhead screws provided with the CMA kit, attach the CMA attachment bracket to the rear end of the outer slide, on its outside surface. The images below show the progression of steps from left to right.
Insert the right rail subassembly into the rack. Attach the adjustable rear mounting bracket to the rail first, ensuring that the rail subassembly occupies the lower 2U portion of the allotted 4U space. The rear mounting bracket spring will clip onto the rail. Ensure that the quantity-2 all-in-one rail kit mounting hardware fully seats into the rack post mounting hole.
Attach the front mounting bracket to the rack post, ensuring that the rail subassembly occupies the lower 2U portion of the allotted 4U space. The front mounting bracket spring will clip onto the post. Ensure that the quantity-2 all-in-one rail kit mounting hardware fully seats into the rack post mounting hole.
Secure the front and back rail kit mounting brackets with the three 10-32 panhead screws provided,on the top and bottom PEM locations on the back mounting bracket, and the bottom PEM location on the front mounting bracket (total quantity-3). Torque to 3.95 N-m (35 lbf-in).
Repeat Steps 7 through 10 for the left rail subassembly
Insert the quantity-4 (quantity-2 per side) cage nuts provided into the rack in the second-to-top and third-to-top square holes in the 4U space (mates to thumbscrew and panhead screw in Step 21)
While heeding the following safe handling precautions, ensure the middle slide ball bearing track is fully seated to the front of the middle slide. This step is critical for proper rail sequencing and full engagement of the inner rail on the middle rail. In the example on the left (below), the ball bearing track is not fully seated to the front of the middle slide.
Warning: Safe handling precautions:
- Do not drop or lift the chassis using a mechanical lift while inner rails are engaged with middle rails. The middle and inner rails should be properly aligned before engagement, so they glide smoothly during the entire insertion
- The Disk Enclosure must be entirely supported by the mechanical lift until the rails are locked in the service position. Failure to do so can cause mechanical failure and serious personal injury.
- Do not push the chassis into the rack using the mechanical lift. The insertion force must be manual, and unassisted by mechanical force or additional mass. Using the lift for this purpose could damage rails.
- Do not bend the middle rail in order to force alignment with the inner rail. Alignment should be adequately established with the lift.
- If fine-tuning of alignment adjustments are required, do not adjust using the mechanical lift. Adjustments should be made by shifting the chassis itself; not the lift, and not the middle rail.
- Lower the lift only after the service position is reached, and the rail is locked in place. Lower the lift by no more than 2"– 3" while the chassis is inserted from the service position into the rack.
- The inner rails/chassis and the middle rails must be kept level, straight, and fully parallel during the entire installation. Failure to comply can cause inadequate rail engagement, and possible damage to the rails.
Extend the middle rail of both the left and right rail kit sub-assemblies roughly three inches beyond the face of the rack.
Position the chassis with the lift such that the inner rails are lined-up perfectly with the middle rails. The end of both inner rails should be equidistant from the rack face. To make adjustments to the alignment, shift the chassis on the left until alignment of both sides is adequate.
Keeping the chassis stationary, pull the middle rails forward onto the inner rails, ensuring full engagement of the inner rails onto the middle slide track. Middle slides should slide freely and smoothly onto inner rails. Difficult middle slide movement during this step typically indicates misalignment.
Middle-rails will eventually “click” into place as the service position locks engage. Ensure both sides engage at the same time, and both inner rails are fully engaged on their respective middle slide tracks.
Carefully and slowly lower the mechanical lift two to three inches so that the weight of the chassis now fully rests on the rail kit. Keep the lift elevation two to three inches below the chassis elevation until the enclosure is fully installed in the rack. This is a safety measure in case the rails are not seated properly, or another mechanical/integration failure occurs.
Locate the inner slide lock springs on both the left and right rail kits, and depress both to disengage the service protection lock. Continue depressing springs while inserting the chassis far enough to bypass the locks on both sides.
Continue inserting the chassis all the way into the rack, ensuring the chassis ears are coincident with the rack mounting flanges.
Secure the 4U chassis ears to the rack/rail kit with embedded thumbscrews (quantity-2, 1perside). For shipping and transport, secure the 10-32 panhead screws provided, and torque to 3.96 N-m (35 lbf-in) (quantity-4, 2 per side).
Using the quantity-2 panhead screws provided, attach the CMA chassis attachment bracket to the chassis above the CMA shelf, on its inner surface. Torque screws to 1.36 N-m (12 lbf-in). The images below show the progression of steps from left to right.
Clip the CMA "B" bracket onto the right rail subassembly CMA attachment bracket (from Step 7). Ensure that the blue spring clips onto the C-shaped CMA attachment bracket securely, and the arrow next to the "B" mark on the CMA arm is pointed upward. The "B" bracket should reside outside of the CMA ramp "lip" (see middle photo).
Clip the CMA "A" bracket onto the chassis CMA attachment bracket (from Step 22). Ensure that the blue spring clips onto the C-shaped CMA attachment bracket securely. The "A" bracket should reside inside the CMA ramp "lip" as shown above
Install the crossbar.
Install the shipping screws (optional step required only for preventing non-operating transportation shock/vibration)

The figure above identifies an installed shipping screw using a red arrow. A shipping screw installs above each of the crossbar thumbscrews as shown in the enclosure rear panel view included above this step.

Note: After the enclosure is secured in the rack, install the disks.