Access Method
This section explains the connection configurations between server Host Bus Adapters (HBAs) and ETERNUS AF
host interface ports.
■
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 86
Single Path Connection (When a SAN Connection Is Used – Direct Connection)
Server
HBA
Server
HBA
ETERNUS AF
CM#0
CA
Port
Port
CA
CM#1
Port
Port
Figure 87
Single Path Connection (When a SAN Connection Is Used – Switch Connection)
Server
HBA
Server
HBA
Server
HBA
Switch
ETERNUS AF
CM#0
CA
Port
Port
CA
CM#1
Port
Port
3. Connection Configuration
SAN Connection
147
Design Guide
Содержание ETERNUS AF S3 Series
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