N-1 redundancy

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:

Examples of Windows and Linux high availability modules

Here are some examples of mirror application modules:

Here are some examples of farm application modules:


As an example, see the following video demonstrating the deployment of one mirror module with Microsoft SQL Server 2012 R2. The operation can be repeated with other mirror modules and with other applications.

For more information on mirror modules deployed on Windows or Linux, click here.


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