N-1 redundancy

Evidian SafeKit

High availability with data replication and application failover from N servers to 1

The SafeKit HA software provides a simple N-1 redundancy cluster with N applications running on N servers and with a single backup for failover. In a SafeKit N-1 redundancy cluster, each application works on its own replicated directories.

SafeKit N-1 redundancy cluster

In case of failure of one primary server unlike the active-active cluster, the backup server doesn't have to handle a double workload. This assumes there is only one failure at a time in the N-1 redundancy cluster - the solution can support multiple primary server failures at the same time, but in this case the single backup server will have to handle the combined workload of all the failed servers.

How to implement N-1 redundancy?

The SafeKit N-1 redundancy cluster is simply configured by deploying N mirror modules on N+1 servers.

Note that:

  • all applications (Appli1, Appli2, Appli3) must be installed on the single backup for application failover,
  • each mirror module will have its own virtual IP address, its own replicated file directories and its own recovery scripts.

SafeKit High Availability Differentiators against Competition

SafeKit Modules for Plug&Play High Availability Solutions

Demonstrations of SafeKit High Availability Software

SafeKit Webinar

This webinar presents in 10 minutes Evidian SafeKit.

In this webinar, you will understand:

  • mirror and farm clusters
  • cost savings against hardware clustering solutions
  • best use cases
  • the integration process for a new application

Microsoft SQL Server Cluster

This video shows a mirror module configuration with synchronous real-time replication and failover.

The file replication and the failover are configured for Microsoft SQL Server but it works in the same manner for other databases.

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Apache Cluster

This video shows a farm module configuration with load balancing and failover.

The load balancing and the failover are configured for Apache but it works in the same manner for other web services.

Free trial here

Hyper-V Cluster

This video shows a Hyper-V cluster with full replications of virtual machines.

Virtual machines can run on both Hyper-V servers and they are restarted in case of failure.

Free trial here