Primary system failure workflow

The table below outlines what happens when the primary system for an active/passive link fails.

StepWhat you doWhat happens
Primary system fails
1On the replica, fail over the linkApplicable tenants and directories on the replica become read-write; applicable tenants and directories on the primary system either remain read-write or become read-only depending on whether the two systems can communicate with each other; if DNS failover is enabled, the replica broadcasts new DNS configuration
2If DNS failover is disabled, direct clients to write only to the replica
Primary system comes back online
3

If the primary system has been rebuilt:

  • On the primary system, upload the replication SSL server certificate from the replica
  • On the replica, upload the replication SSL server certificate from the primary system
4On the replica, update the link configuration as needed
5If the link is broken, on the replica, send a request to restore the linkReplication link is recreated
6On the replica, begin data recoveryApplicable tenants and directories on the replica remain read-write; applicable tenants and directories on the primary system remain or become read-only; data recovery from the replica to the primary system begins
7Wait for data recovery to come close to being up to date
8On the replica, complete data recoveryApplicable tenants and directories on the replica become read-only; applicable tenants and directories on the primary system remain read-only; data recovery from the replica to the primary system continues to completion
Data recovery finishes
9NothingApplicable tenants and directories on the replica remain read-only; applicable tenants and directories on the primary system become read-write; the primary system and the replica broadcast original DNS configurations; replication from the primary system to the replica restarts
10If DNS failover is disabled, after you see this message in the system log, direct clients to write only to the primary system: Replication data recovery completed