Redundant Method
This section explains a NAS connection and also a configuration with a NAS connection for the ETERNUS DX.
IMPORTANT
During the configuration phase
Specify an IP address in a different subnet for each NAS port in the same controller.
Single Path Connection
For a single path connection, only one controller is connected to the NAS network.
If an error occurs on the path of a connected controller, client access cannot be performed. The system must be
stopped during the replacement of failed components and controller firmware.
For a single path connection, the failover function cannot be used.
Figure 116 Single Path Connection (When a NAS Connection Is Used)
LAN
PortP
ort
PortP
ort
LAN
Client
LAN
Client
ETERNUS DX
NIC-CANIC-CA
CM#0 CM#1
Multipath Connection (Active-Active Connection)
A Multipath connection (Active-Active connection) is a configuration in which two controllers are connected to
the same NAS network. System reliability is improved due to the path redundancy.
If a link down occurs in a connected controller, access can be continued by switching to another controller via
the failover function.
Even when a controller or NIC-CA fails, operation can continue by giving the information to the normal
controller. After a failed component is replaced with a normal component, the connection type returns to the
previous settings.
Caution
During the configuration phase
• A different IP address on the same subnetwork must be set for the redundant port.
• A configuration with an Active-Standby connection is not supported.
5. Connection Configuration
NAS Connection
222 Design Guide
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