Installing the support rails

Use the following templates to identify the locations for inserting M5 screws when you mount the support rails and in a rack. The locations for the M5 screws are highlighted in the templates.

Figure 1. 4U front rack-mounting template

Figure 2. 4U rear rack-mounting template

GSS storage enclosures are 2U or 4U high. Align the template with the rack at a U boundary. U boundaries are shown as horizontal dashed lines in the rack-mounting templates.

Before you install a storage enclosure in a rack, you must install the rails and rack-mounting hardware that come with the storage enclosure. GSS storage enclosures require an Electronic Industries Association (EIA) 310-D Type A 19-inch rack. The distance between EIA rails, from the front to the rear of the rack, is 76 cm (30 in.) minimum and 81.28 cm (32 in.) maximum. This rack conforms to the EIA standard. Where you place the support rails in the rack depends on where you intend to place the storage enclosure.

Use the front and rear rack-mounting templates to align the support rails and rear brackets with the correct rack holes. If the support rails will be installed above an existing storage subsystem or storage enclosure, position the storage enclosure support rails directly above it. If the support rails will be installed below an existing storage enclosure, allow 178 mm (7 in.) of vertical clearance for the GSS storage enclosure.

To install the left and right support rails in the rack, complete the following steps:

1. Make sure that the rack has already been installed.
2. Make sure that a stabilizer has been attached correctly to the bottom front of the rack to prevent the rack from tipping forward while the storage enclosure is being installed.

   See the rack documentation for more information.

3. Locate the two support rails, eight M5 screws, and eight washers that come with the storage enclosure.
   Note: The screws and washers might already be attached to the support rails. If they are, remove them from the support rails.
4. Starting with the left support rail, loosen the two rail-adjustment screws with a medium flat-blade screwdriver. The rail-adjustment screws are used to lock the support rails at a certain length.
   Note: The support rails are not marked as left or right. However, each rail can be mounted correctly on only one side of the rack. Install each rail with the alignment pin at the rear of the rack.
   
5. Hold the front of the left support rail against the inside of the front rack-support flange, and extend the rear of the support rail until it makes contact with the rear rack-support flange. The alignment pins at the rear of the support rail slide into the mounting holes at the rear of the rack. The wider end of the support rail must be positioned at the front of the rack.
6. From the front of the rack, with the support-rail flanges positioned inside the rack support-rail assemblies, insert two M5 screws with washers through the front of the rack and screw them into the support-rail front flange. Be sure to use a washer when you install an M5 screw through a square hole on a rack-mounting flange.
   Attention: Make sure that the screws are tight enough to support the weight of the storage enclosure, but do not completely tighten the screws yet.
7. Make sure that the holes in the support rail above and below the top mounting screw are visible through the holes of the rack flange, and tighten the two M5 screws to secure the front of the support rail to the rack flange.
8. From the rear of the rack, insert two M5 screws with washers through the rear of the rack, and screw them into the support-rail rear flange.
9. Tighten the two rail-adjustment screws with a medium flat-blade screwdriver.
10. Repeat steps 4 through 9 for the right support rail.
    Note: Because the mounting holes on the rack are not always the same size as the mounting screws, the lip of each of the support rails might not line up evenly. Make minor adjustments to ensure that the lip of the left and right support rails are lined up evenly on the racks. Failure to do so will cause the storage enclosure to fit unevenly in the rack.
11. Locate the two rear brackets, four M5 screws, four washers, and four clip nuts that come with the storage enclosure.
12. Install the rear brackets at the rear of the rack as shown in the following illustration, using the M5 screws, washers, and clip nuts to secure the brackets to the rack-mounting holes. Do not tighten the screws until the storage enclosure is installed in the rack (see step 8).
    
13. Continue with Installing the storage enclosure in a rack.