The following scenarios demonstrate how Global Presence improves resiliency while protecting data and ensuring content availability.
Scenario 1 | |
Event | One of the MongoDB servers of an FT cluster is unavailable. |
Impact | No impact. |
Outcome | The node synchronizes as soon as the MongoDB server is available again. |
Scenario 2 | |
Event | Two of the MongoDB servers of an FT cluster in the same region are unavailable. |
Impact | No impact. |
Outcome | The primary server in Europe performs all read and write operations until one of the edge servers is available again. |
Scenario 3 | |
Event | One of the MongoDB servers of a Nerada cluster is unavailable. |
Impact | No impact. |
Outcome | The node synchronizes as soon as the lost MongoDB server is available again. |
Scenario 4 | |
Event | Two of the MongoDB servers of a Nerada cluster in the same region are unavailable. |
Impact | Since there is no longer a MongoDB server available locally, the closest remote server is used. |
Outcome | Portal performance is degraded locally until at least one of the servers is available again. |
Scenario 5 | |
Event | An edge data center fails to establish a VPN connection to the primary data center in Europe. |
Impact | There may be a short interruption in service for the edge data center that loses its VPN connection, and users in the region may temporarily be unable to upload content. However, if a user does manage to upload content, indexation remains available. Administration interfaces that require a VPN connection (BO, indexing servers, Analytics) are not available. There is no effect for the other data centers. |
Outcome | In the region that experienced an issue, service returns to normal as the VPN connection is reestablished. |
Scenario 6 | |
Event | The VPN connection is lost in the primary data center and all edge data centers simultaneously. |
Impact | Portal performance is severely degraded. It is still possible to browse content, but it is impossible to upload, and indexation is not available. |
Outcome | Portal performance returns to normal as soon as the primary data center reestablishes its VPN connection. Components are restored in the AWS cloud infrastructure. |