Connecting multiple ES30 shelves to the DD9500 /DD9800
system
The cabling diagrams in this section show the maximum configurations for the
DD9500 and DD9800 systems. Not all systems will have all the disk shelves shown in
the diagrams.
Add shelf-to-shelf cables between shelves in a loop and to the controller as shown in
the diagrams.
1.
Cable from the B Controller EXPANSION
port of the lower shelf to the B
controller HOST port of the next higher shelf.
2. Then cable from the A Controller HOST port of lower shelf to the A controller
EXPANSION
port of the next higher shelf
3. There are no specific placement or cabling requirements for SSD shelves, or the
metadata shelves for DD Cloud Tier configurations. These shelves can be installed
and cabled the same way as standard ES30 shelves.
4. The SSD shelf counts towards the total number of shelves connected to the
system.
5. 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.
6. Use the cable management assembly to support and organize all cables from the
DD9500/DD9800 system.
Select the appropriate configuration from the following list, and connect the disk
shelves to the Data Domain controller.
l
on page 56
l
DD9500 /DD9800 with HA (one rack)
on page 58
l
DD9500 /DD9800 with HA (two racks)
on page 60
l
DD9500 /DD9800 with DD Cloud Tier (Single node or HA)
on page 63
l
on page 66
DD9500 /DD9800
For a base DD9500 /DD9800 system:
String
(Loop)
I/O - Port
Shelf Port
Length
1
I/O 3 - Port 1
B controller HOST
port of shelf V1.1
2M
Connect Cables and Power on
56
Data Domain DD9500 and DD9800 Systems
6.1
Hardware Overview and Installation Guide
