Note
1RU = 1 Retention Unit , size equal to active tier
1. If you already have more than 1 RU, you get to keep it when you upgrade to DD OS
5.5.1. But there is a caveat: you cannot use encryption or any new feature that we
add after 5.5.1.
2. You cannot configure more than 1RU per storage tier when using DD OS 5.5.1 and
later.
Installing or adding ES30 and FS15 shelves
Refer to the table and related information in
Shelf cabling rules and guidelines
21 for shelf configuration restrictions.
Ports
Depending on the model, a Data Domain system has one to four dual- or quad-port
SAS HBA cards or SAS I/O modules installed. The ES30 shelf has two controllers (B
located above A). Each controller has two ports, a host and an expansion port.
Data Domain-Specific Installation
on page 111 for SAS HBA card, SAS I/O
module, and port locations.
Cabling shelves
Note
l
Before cabling the shelves, physically install all shelves in the racks. Refer to the
rail kit installation instructions included with the ES30 shelf for rack mounting.
l
The documentation refers to two SAS HBAs. If only one HBA is allowed in a
system, then use another port as defined later for that specific system.
l
On an HA system, add cables from the second node to open ports at the end of
the sets. The ports on the second node must connect to the same sets as the
corresponding ports on the first node.
Ports on the Data Domain system’s SAS HBA cards connect directly to a shelf
controller’s host port. For redundancy, you need to create dual paths by using a port
on one SAS HBA card to connect to one shelf controller in each shelf set, and a port
on another SAS HBA card to connect to another shelf controller in the same shelf set.
With dual paths, if one SAS HBA card fails, the shelf is still operational. However, in
the unlikely event any single shelf becomes completely disconnected from power or
SAS cables and becomes disconnected from a previously operational shelf, the file
system goes down and the shelf is not operational. This is considered a double failure.
There are two kinds of configurations: one shelf in a set or multiple shelves in a set.
Installing the Shelves
28
Data Domain ES30 Expansion Shelf and FS15 SSD Shelf
Hardware Guide
