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 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 32 Backend Cable Connection Usage
Cable length
Usage
1.1m
Provided with drive enclosures.
3.5m
Used as extension cables when the lengths of the provided cables are not sufficient.
These cables are used for the following purposes:
•
Reverse cabling when more than four drive enclosures are installed on a single node
•
When crossing over 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
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FUJITSU Storage ETERNUS DX8100 S3/DX8700 S3/DX8900 S3 Hybrid Storage Systems Site Planning Guide
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