When you set up a stateful failover system, follow these restrictions and guidelines:
Use stateful failover if your service system has a low tolerance to service interruption or provides criterial services.
Connect CVK hosts to CVM hosts by using Gigabit links or faster links.
You can assign the primary and backup nodes as CVK hosts to the host pools managed by themselves.
You cannot split a stateful failover system into two independent CVM platforms.
You can set up a stateful failover system only when deploying CVM. You cannot set up a stateful failover system for deployed CVM because data of deployed CVM is cleared in stateful failover system setup.
Transient service interruption might occur in primary/backup switchover.
If the stateful failover system splits because of network anomalies, the nodes in the system automatically elect the primary node after the network recovers. If CVK hosts are sending performance statistics to the backup node when the split-brain failure occurs, the hosts will still send performance statistics to the backup node after the stateful failover system recovers, which causes data loss on the primary node. To resolve this issue, you must connect the CVK hosts to the primary CVM platform.