Shelf cabling rules and guidelines
The Data Domain system re-discovers newly configured shelves after it restarts. You
can power down the system and re-cable shelves to any other position in a set, or to
another set. To take advantage of this flexibility, you need to follow these rules before
making any cabling changes:
l
Do not exceed the maximum shelf configuration values for your Data Domain
system as listed in the table below.
l
For redundancy, the two connections from a Data Domain system to a set of
shelves must use ports on different SAS IO modules.
l
Use the Installation and Setup Guide for your Data Domain system to minimize the
chance of a cabling mistake.
l
A Data Domain system cannot exceed its maximum raw external shelf capacity,
regardless of added shelf capacity.
l
ES20 shelves must be on their own chain(s).
l
ES20 shelves are only allowed to be connected to DD6300, DD6800 and DD9300,
and DD9500 or DD9800 systems to migrate the data using the shelf migration
software feature in DD OS 5.7 or later releases.
l
ES30 SATA shelves must be on their own chain.
l
If ES30 SAS shelves are on the same chain as a DS60, the maximum number of
shelves on that chain is 5.
l
DD OS 5.7.1 does not support ERSO on DD9500 HA systems.
l
DD OS 5.7.1 does not support HA with SATA drives.
Table 11
Shelf configuration supported per Data Domain system for the DS60 shelf
DD system Memory
required
(GB)
SAS
cards/
port per
card
DS60 support
(TB)
Max
shelves
per set
Max
number
of sets
Max
external
capacity
available
(TB)
1
Max RAW
external
capacity
(TB)
DD4200 128 2x4 SAS 45 1 4 192 240
DD4200 ER
2
128 4x4 SAS 45 2 8 384 480
DD4500 192 2x4 SAS 45, 60 2 4 288 360
DD4500 ER
2
192 4x4 SAS 45, 60 2 8 576 720
DD6300
5, 6
48
9
1x4
8
N/A 0 0 48 60
DD6300 w/
Expanded Capacity
5, 6
96 1x4
8
SAS 45, 60
15
1 1 144 180
DD6800
5, 6, 11
192 2x4 SAS 45, 60 1 1 144 180
DD6800 w/
Expanded Capacity
5, 6
192 2x4 SAS 45, 60 1 2 288 360
Installing the Shelves
Shelf cabling rules and guidelines 21
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