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:
l
The SSD shelf counts towards the total number of shelves connected to the
system.
l
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
st
hop where
data will be written. If the 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
st
shelf of a chain.
Install the System in the Rack
50
Data Domain DD9500 and DD9800 Systems
6.1
Hardware Overview and Installation Guide
