8.4.2.1 Single or Multiple Site Failure

This scenario applies when one or more sites, and not all sites, have failed and there is a requirement to perform fault recovery. It is assumed that you have cnDBTier and Policy installed on multiple sites with automatic data replication and backup enabled.

Note:

It is assumed that one of the cnDBTier is in healthy state.

To recover the failed sites, perform the following steps:

Note:

Ensure that all the prerequisites mentioned are met.

1. Uninstall Policy. For more information, see the Uninstalling CNC Policy section in Oracle Communications Cloud Native Core, Converged Policy Installation, Upgrade and Fault Recovery Guide.
2. Install a new cluster by performing the Cloud Native Environment (CNE) installation procedure. For more information, see Oracle Communications Cloud Native Core, Cloud Native Environment (CNE) Installation and Upgrade Guide available on My Oracle Support.
3. Install cnDBTier, in case replication is down or cnDBTier pods are not up and running. For information about installing cnDBTier, see Oracle Communications Cloud Native Core, cnDBTier Installation and Upgrade Guide.
4. Perform DBTier fault recovery procedure:
   1. Perform DBTier fault recovery procedure to take backup from older healthy site by following the Create On-demand Database Backup procedure in Oracle Communications Cloud Native Core, cnDBTier Installation and Upgrade Guide.
   2. Restore the database to new site by following the Restore Database with Backup procedure in Oracle Communications Cloud Native Core, cnDBTier Installation and Upgrade Guide.
5. Install Policy Helm charts. For more information on installing Helm charts, see Oracle Communications Cloud Native Core, Converged Policy Installation, Upgrade and Fault Recovery Guide.