Chapter 3 Connections
3.1 Host Connections
ETERNUS DX80 S2/DX90 S2 Disk storage system User’s Guide -Site Planning-
Copyright 2013 FUJITSU LIMITED P3AM-4822-12ENZ0
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■SAS

Simple, cost effective, and high performance network storage environment can be configured.
Direct connections and switch connections to servers are available.
The maximum transfer speed is 6Gbit/s.
3.1.2 Host Connection Path
This section explains the connection configuration between server Host Bus Adapters (HBAs) and ETERNUS DX
Disk storage system host interface ports.

■Single path configuration

A single path configuration connects the ETERNUS DX Disk storage system to a server via a single path.
The server cannot access an ETERNUS DX Disk storage system when a component (such as a controller, HBA,
switch, or cable) on the path has a problem. The system must be stopped during the replacement of failed
components and controller firmware.
In a single path connection configuration, the path failover and load balancing functions are not supported.
A multipath connection configuration is recommended to maintain availability when a problem occurs.
Figure 3.1 Single path connection (direct connection)
When SAS switches are used, zoning should be set for the SAS switches to ensure the security of data.
Server
HBA
Server
HBA
ETERNUS DX Disk storage system
CM#0
CA
Port
Port
CA
CM#1
Port Port