Chapter 4. Infrastructure planning 111Shipping requirements for X6The Full-length I/O Book cannot be shipped while installed in the x3850 X6 or x3950 X6server. This I/O Book and its adapters must be shipped separately from the server.4.3 Floor clearanceThe server is a traditional rack design and it is installed to the rack rails from the front of therack. Sufficient space to lift and mount the server will be required. See the x3850 X6Installation and Service Guide for information about racking.When the server is mounted in a rack, it will be on non-sliding rails, fixed to the rack. There isno need for additional floor clearance to pull the server out of the rack for maintenance orupgrades. This is because all of the servers serviceable and upgradable components can beaccessed either from the front or from the rear of the server.Having components that are accessed from the front or rear without sliding the server isbeneficial for a number of reasons: The modular design makes the system easier to service as you only need to pull theaffected subsystem without having to pull the entire server out from the rack. As there is no requirement to slide the server in and out of the rack, there are no cablemanagement arms to worry about. The system is easier to install as you can unload all pluggable parts for lower weight whenlifting in to the rack. The system is easier to upgrade from 2S to 4S by simply adding additional ComputeBooks. The system is easier to add additional I/O by hot-swapping and hot-adding an I/O Book toadd more adapters or simply by adding an additional I/O Book to the server. The system is easier to add additional memory by pulling out the appropriate ComputeBook, adding the memory, then reinserting the Compute Book.After the server is installed in the rack, the only floor clearance you will need will be for pullingout and/or installing pluggable components such as the Compute Book, Storage Book, I/OBooks, or power supplies.4.4 Use of the Rear Door Heat eXchangerThere is a Rear Door Heat eXchanger (RDHX) available for the IBM 42U 1100 mm EnterpriseV2 Dynamic Racks.The RDHX has the following features: It attaches in place of the perforated rear door and adds 10mm, making the overallpackage 1200mm, which is the depth of two standard data center floor tiles. The doors use 3/4 inch quick connect couplers, which include automatic valves whichrestrict water leakage, typically a few drops at most, when connecting or disconnecting thedoors. Each door has a capacity of 9 liters (2.4 US gallons), and supports flow rates of 22.7 liters(6 US gallons) to 56.8 liters (15 US gallons) per minute.
