Fujitsu ETERNUS DX S5 Series - Access Method; Figure 106 Single Path Connection (When a SAN Connection Is Used - Direct Connection); Figure 107 Single Path Connection (When a SAN Connection Is Used - Switch Connection)

Access Method
This section explains the connection configurations between server Host Bus Adapters (HBAs) and ETERNUS DX
host interface ports.
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Single Path Connection
A single path configuration connects the
ETERNUS DX to a server via a single path.
The server cannot access an ETERNUS DX when a component (such as a controller, HBA, switch, or cable) on the
path has a problem. The system must be stopped when a failed component on a path needs to be replaced or
when the controller firmware needs to be updated.
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 106 Single Path Connection (When a SAN Connection Is Used – Direct Connection)
Server
HBA
Server
HBA
ETERNUS DX
CM#0
CA
Po
rtPort
CA
CM#1
Port Port
Figure 107 Single Path Connection (When a SAN Connection Is Used – Switch Connection)
Server
HBA
Server
HBA
Server
HBA
Switch
ETERNUS DX
CM#0
CA
Po
rt
Port
CA
CM#1
Port
Port
5. Connection Configuration
SAN Connection
213 Design Guide