Dell EMC Data Domain DS60 Hardware Manual page 28

Installing the Shelves
Data Domain DS60 Expansion Shelf Hardware Guide
28
The ES20 shelves must be on their own set. Minimize the ES20 set count by
l
combining up to four ES20s per set.
ES30 SATA shelves must also be on their own sets. Minimize the ES30 set count
l
by combining up to five ES30s per set. If required, combine up to seven ES30 SAS
shelves per set to minimize the set count.
A set can contain a maximum of two DS60 shelves and, if required because of
l
other restrictions, add ES30 SAS shelves up to a maximum of five shelves in that
set.
Note
The configuration rules apply also to Extended Retention systems.
The following figures show cabling for base systems and systems with the Extended
Retention software.
Note
It is recommended that the DS60 shelf with the greater number of drives should
always be placed in the bottom position.