System failure workflow with an active/active link
The table below outlines what happens when one of the systems involved in an active/active link fails, where the system that fails is system A and the system that remains healthy is system B.
Step | What you do | What happens |
System A fails | ||
1 | On system B, fail over the link | If DNS failover is enabled, system B broadcasts new DNS configuration |
2 | If DNS failover is disabled, direct clients to write only to system B | |
System A comes back online | ||
3 |
If system A has been rebuilt:
| |
4 | On system B, update the link configuration as needed | |
5 | If the link is broken, on system B, send a request to restore the link | Replication link is recreated |
6 | On system B, fail back the link | System A and system B broadcast original DNS configurations; replication restarts in both directions on the link |