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LAN Failover 



LAN Failover in OpenVMS Alpha Version 7.3-2 provides a mechanism to protect your system against a network interface card (NIC) failure. This mechanism provides a failover safeguard for all LAN applications by integrating individual network adapters on the same local network into a single virtual interface called a LAN Failover set.

The system manager defines and creates the LAN Failover set. The failover set consists of one adapter that is to be used for LAN traffic and one or more adapters that remain idle. If the active adapter fails, one of the idle set members automatically takes over with the same address, thereby allowing continuous operation.

LAN Failover determines the status of network interfaces through a virtual driver. It determines which network adapters are functioning and selects one to maintain the LAN traffic. All network protocols can benefit from this type of failover.

LAN Failover enhances the existing disaster-tolerance capabilities of OpenVMS by providing users with a high-availability solution for all LAN applications. For more information about LAN Failover, refer to the HP OpenVMS System Manager's Manual, the HP OpenVMS System Management Utilities Reference Manual, and the HP OpenVMS I/O User's Reference Manual.

failSAFE IP 

The failSAFE IP Version 5.4 feature is another solution for network connectivity failures available to OpenVMS Version 7.3-2 customers running TCP/IP.

failSAFE IP, which ships with HP TCP/IP Services for OpenVMS Version 5.4 product, migrates IP addresses from a failed network interface card (NIC) to a preconfigured NIC on the same node or another node in the cluster. Multiple NICs can be configured with IP addresses in the same subnet. This provides an additional benefit by load-balancing outbound TCP connections and by providing higher aggregate throughput. failSAFE IP can be used only in a TCP/IP environment. For more information about failSAFE IP, refer to the TCP/IP Services for OpenVMS documentation.

LAN Failover and failSAFE IP Comparison compares the features of LAN Failover and failSAFE IP.

Table 3   LAN Failover and failSAFE IP Comparison
Feature LAN Failover failSAFE IP
NIC usage
One NIC active, others are standby.
All NICs active, load balancing.
Devices supported
Ethernet device types - DEGXA, DEGPA, and DE600 series.
Independent of device types.
Protocols
Supports all LAN protocols.
Available only on TCP/IP.
Failover time
Typically milliseconds.
Typically a few seconds.


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