HP Storage Mirroring V5 Software - Manual (Page 15)

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Failure monitoring/failover
Failover is a process in which a target machine stands in for a failed source machine. As a result, user and application requests
that are directed to the failed source machine are routed to the target machine.
Storage Mirroring monitors the status of machines by tracking network requests and responses exchanged between source
and target machines. When a monitored machine misses a user-defined number of requests, Storage Mirroring assumes that
the machine has failed. Storage Mirroring then prompts the network administrator to initiate failover, or, if configured, it
occurs automatically.
The failover target assumes the network identity of the failed source. When the target assumes the identity of the source,
user and application requests destined for the source machine or its IP address(es) are routed to the target. After failover,
user and application requests directed to the source machine are routed to the target machine.
When partnered with Storage Mirroring data replication capabilities, failover routes user and application requests with
minimal disruption and little or no data loss. In some cases, failover may be used without data replication to ensure high
availability on a machine that only provides processing services, such as a web server.
Source Name: Marketing
User and application requests sent to
the source by locating the IP address
Before
IP Address: 125.7.82.43
Target Name: Backup
IP Address: 125.7.82.67
Failover
Occurs
After
Failed Source
User and application requests sent to
the source by locating the IP address
Target Name: Backup
and Marketing
IP Address: 125.7.82.67
and 125.7.82.43
Failover
Occurs