Cable Connection (Between Enclosures)
Reverse cabling can be used to connect enclosures in the
ETERNUS DX when the ETERNUS DX is configured with
two controllers. For reverse cabling, the length of the provided cable between controller 1 (CM#1) and the last
drive enclosure (connection destination) may not be enough. 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.
The cable lengths that are required between enclosures should be taken into consideration when enclosure in-
stallation locations are being determined.
For 2U drive enclosures (2.5" type and 3.5" type), the length of the provided cables between enclosures is
0.75m.
For 4U drive enclosures (high-density drive enclosures), the length of the provided cables between enclosures is
2.5m.
For extended connections, 2.5m, 3.5m, 6.0m, 15m, and 30m cables are available.
Cables with a length of 0.75m, 2.5m, 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.
The following guideline shows how the mini SAS HD cables between enclosures should be used according to
their cable length.
Table 22 Usage of Cables for Connecting Enclosures
Cable length Usage
0.75m Provided with 2U drive enclosures and used for connecting 2U drive enclosures.
2.5m Provided with 4U drive enclosures. These cables can also be used as extension cables when the
lengths of the provided cables are insufficient.
These cables are used for the following purposes:
•
Connection between 4U drive enclosures
•
Connection between 2U and 4U drive enclosures
•
Reverse cabling when two or more 2U drive enclosures are installed
3.5m Used as extension cables for connections between the racks.
6.0m Used as extension cables when the connection length between the racks is more than 3.5m.
15m Used as extension cables when the connection length between the racks is more than 6.0m.
30m Used as extension cables when the connection length between the racks is more than 15.0m.
2. Rack Installation Specifications
Rack Installation Requirements
47
FUJITSU Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems
Site Planning Guide
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