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connecting Multiple Expansion Shelves
NOTE:
This guide describes the installation of new systems comprised of all
ES30 SAS shelf models. Configurations including a mix of ES20, ES30 SATA,
and ES30 SAS shelves are subject to additional configuration constraints. The
instructions for mixing shelf types are in the ES30 Hardware Guide.
ExPanSion SHElF cablinG
The system supports any combination of 30 and 45 TB ES30 SAS shelves up
to a maximum of 8 shelves with 240 TB of raw storage. Multiple expansion
shelves are connected together and to the controller with qualified SAS
cables. Save extra SAS cables for future use. See Figure 4 for the recom-
mended cabling and component placement of a system. The cables provided
support the DD4200 and ES30s in the rack positions as shown.
Note:
Cables have an HD-mini-SAS end that connects to the controller and a
mini-SAS end that connects to the shelves.
ES30 Expansion Shelves
4 Use a SAS cable with mini-SAS connectors for any ES30 SAS connection.
4 Cables should be dressed to the side of the rack and supported with Velcro
straps to allow for easy removal of a shelf controller or power supply.
Hot aDDition oF ExPanSion SHElvES
NOTE:
In Figure 4 the shelves are labeled VN.M. VN refers to string "N" and the
"M" is the number of the shelf in the string. For example, V2.2 refers to the second
shelf in the second string. The cabling and racking are designed so that shelves
are added from the bottom up in a rack. Therefore, shelves are added V1.1, V1.2,
V1.3, V1.4. V2.1, V2.2, and so on. Add shelves in order, one at a time. Refer first to
the Cabling Instructions table for adding or moving HBA-to-shelf cables. Then add
the necessary shelf-to-shelf cables between shelves in a string as shown in Figure
4. Note that the added shelf will become the highest number shelf in its string,
requiring one HBA-to-shelf cable to be moved to connect to its controller A or
controller B HOST port. The ES30 uses the markings
to indicate an EXP'N port.
Cabling between adjacent shelves in a string is done with the 1M SAS cables
that are delivered with the shelves. Cable from the B Controller EXPANSION
port of lower shelf to the B controller HOST port of the next higher shelf.
Then cable from the A Controller HOST port of lower shelf to the
A controller EXPANSION port of the next higher shelf.
When adding shelves to an existing string, move the cable from the B
controller HOST port to the new shelf. And then add the shelf-to-shelf 1M
cables. 2M or 3M cables may be used from the controller to the shelves. The
cables shipped depend on the configuration. Loop any excess and use the
Velcro straps to attach to a convenient place in the rack. "3" is the top HBA
port and "0" is the bottom.
Power-up and Final configuration
Follow the steps described in Chapter 4, Post Installation Tasks, of the ES30
Expansion Shelf Hardware Guide to complete hot addition of expansion
shelves to an existing system.
cablinG inStructionS
String
IO port
Shelf port
1
A7 Port 1 B controller HOST port of shelf V1.1
1
A8 Port 0 A controller HOST port of the highest number shelf in V1
2
A7 Port 0 B controller HOST port of shelf V2.1
2
A8 Port 1 A controller HOST port of the highest number shelf in V2
* Cable lengths shown are designed for EMC racks. Other racks may require longer cables.
to indicate a HOST port and
Length*
2M
2M
2M
2M
FiGurE 4: rEcoMMEnDED ES30 cablinG
EMC DATA DOMAIN DD4200 INSTALLATION AND SETUP GUIDE | SIDE 1
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