Installing The Expansion Shelves Into The Racks; Rear Of The Rack Mount Rail - Dell EMC Data Domain DD9800 Installation Manual

Figure 19. Rear of the rack mount rail
5. Insert cable management assembly into rear of rack mount rails.
6. When the cable management assembly is securely installed into the rack mount rails, then rotate the two blue knobs
clockwise or counterclockwise to lock the cable management assembly into the rack mount rails.
7. To adjust the CMA position up or down, pull on the orange latches and pull up or down on the arm simultaneously as needed
for accessing the power cables.
NOTE: You do not need to remove the CMA to access the I/O modules, the managements module, and the powers
supply units for removal and replacement. Just adjust the CMA arms.
8. For HA systems, repeat this procedure to install the CMA for the second node.

Installing the expansion shelves into the racks

CAUTION:
● Data Domain systems are heavy. Always use two people or a mechanical lift to move and install a Data Domain
system. Use caution to install the expansion shelves.
● Ensure that each rack is securely anchored to prevent tipping.
1. From the front of a rack, lift the shelf to the designated rack location.
2. Add shelves to the racks in order, one at a time, from the bottom of a rack to the top filling each string in that rack before
going to the next.
NOTE: Strings in add-on racks may connect to the same string number in other racks.
Shelves are added in the order V1.1, V1.2, V1.3, V1.4, V2.1, V2.2, and so on. Shelves are labeled VN.M. VN refers to string "N"
and the "M" is the number of the shelf in the string. For example, V3.2 refers to the second shelf in the third string.
3. Secure each expansion shelf in the rack.
4. When installing an SSD shelf for Data Domain metadata on flash:
● The SSD shelf counts towards the total number of shelves connected to the system.
● Data Domain recommends installing the SSD shelf in the V1.1 positon, but if that is not possible, the shelf can be placed in
a different location in the rack so long as cables of sufficient length are available.
NOTE: V1.1 is recommended for better performance because this will the 1
SSD shelf is connected to the last enclosure in a chain, then each read/write request has to go through many hops,
which introduces latency issues when compared to when the SSD shelf is on the 1
24 Install the System in the Rack
st
hop where data will be written. If the
st
shelf of a chain.