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2. Rack Installation Specifications
Rack Installation Requirements
Backend Cable Connection
The connection between the controller enclosure and the drive enclosure is called a back-end connection.
In the ETERNUS DX, controller enclosures are connected to drive enclosures with backend cables (Mini SAS HD).
For reverse cabling, the connection destination for controller 1 (CM#1) must be the last drive enclosure.
Longer cables may also be required according to the installation locations of enclosures that are used in the
same rack or the installation locations of enclosures that are used in multiple racks.
For drive enclosures (2.5" type and 3.5" type), the length of the provided cables between enclosures is 1.1m.
For high-density drive enclosures, the length of the provided cables between enclosures is 3.5m.
For extended connections, 3.5m, 6.0m, 15m, and 30m cables are available.
The following guideline shows how the backend cables should be used according to their cable length.
The type of backend cable differs depending on the cable length.
Cables with a length of 1.1m, 3.5m, and 6.0m are Mini SAS HD copper cables, and cables with a length of 15m
and 30m are Mini SAS HD active optical cables. There are no operational issues even if different types of cables
exist in the ETERNUS DX.
Table 21
Backend Cable Connection Usage
Cable length
1.1m
3.5m
6.0m
15m
30m
Usage
Provided with 2U size drive enclosures and used for connections between 2U size drive enclosures.
Provided with 4U size drive enclosures.
Used as extension cables when the lengths of the provided cables are not sufficient.
These cables are used for the following purposes:
•
Connections between 4U size drive enclosures
•
Reverse cabling when more than four drive enclosures are installed on a single node
Used as extension cables when the connection length is more than 3.5m or for connections between
the racks.
Used as extension cables when the connection length between the racks is more than 6.0m.
Used as extension cables when the connection length between the racks is more than 15.0m.
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