To prepare a rack for adding Drive Enclosures to the Oracle Flash Storage System, you must install rails in the rack for each Drive Enclosure that you plan to add. Oracle includes rail kits in the Drive Enclosure packaging.
Use one of the following racks for the Drive Enclosure:
Sun Rack II 1042/1242 rack
Any 19-inch wide, four-post, EIA-compatible rack with a front-to-back depth between vertical cabinet rails of 24 inches to 36 inches (61 cm to 91 cm)
Drive Enclosures rail kits can be installed in racks with the following types of holes:
Square
Round
Threaded (must be M6 or 10-32 racks)
The following figure shows examples of supported rack holes.
Figure 1 Examples of supported rack holes 
- Legend
1 Square holes 3 Threaded holes 2 Round holes
The following figures show the rails for both Drive Enclosure types.
Figure 2 Rails for the DE2-24P Drive Enclosure 
- Legend
1 Left-side rail for square-hole and round-hole racks 2 Adaptor pins for threaded-hole racks
Figure 3 Rails for the DE2-24C Drive Enclosure 
- Legend
1 Left-side rail for square-hole racks 3 Round-hole racks 2 Threaded-hole racks