2.1.2.2 Cable Connection (Between Enclosures)
Reverse cabling can be used to connect enclosures in the ETERNUS DX. 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.
For 2U drive enclosures (2.5" type and 3.5" type), the length of the provided cables between enclosures is
1.1m.
For 4U drive enclosures (high-density drive enclosures), the length of the provided cables between enclo-
sures is 3.5m.
For extended connections, 2.5m, 3.5m, and 6.0m cables are available.
The following guideline shows how the mini SAS HD cables between enclosures should be used according to
their cable length.
Table 2.2 Usage of Cables for Connecting Enclosures
Cable length
Usage
1.1m These cables are provided with 2U drive enclosures and are used for connecting 2U drive en-
closures.
2.5m These cables are used as extension cables when the lengths of the cables that are supplied
with 2U drive enclosures as standard are not sufficient.
3.5m These cables are provided with 4U drive enclosures. These cables can also be used as exten-
sion cables when the lengths of the provided cables are insufficient.
These cables are used for the following purposes:
•
Connection between 4U drive enclosures
•
Reverse cabling when five or more 2U drive enclosures are installed
•
When crossing over racks
6.0m
Used as extension cables for connections between racks.
Chapter 2 Rack Installation Specifications
2.1 Rack Installation Requirements
39
FUJITSU Storage ETERNUS DX500 S3/DX600 S3 Disk storage system Site Planning Guide
Copyright 2014 FUJITSU LIMITED
P3AM-7712-05ENZ0
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