Access Method; Figure 79 Single Path Connection (When A San Connection Is Used - Direct Connection); Figure 80 Single Path Connection (When A San Connection Is Used - Switch Connection) - Fujitsu ETERNUS AF250 Design Manual

2. Connection Configuration
SAN Connection

Access Method

This section explains the connection configurations between server Host Bus Adapters (HBAs) and ETERNUS AF
host interface ports.
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Single Path Connection
A single path configuration connects the ETERNUS AF to a server via a single path.
The server cannot access an ETERNUS AF 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 79 Single Path Connection (When a SAN Connection Is Used — Direct Connection)
Server
HBA
Port Port
CA
CM#0
Figure 80 Single Path Connection (When a SAN Connection Is Used — Switch Connection)
Server
HBA
Port Port
CA
CM#0
Server
HBA
Port Port
CA
CM#1
ETERNUS AF
Server Server
HBA HBA
Switch
Port Port
CA
CM#1
ETERNUS AF
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