When a failover does occur, the sessions are handled in one of two ways: stateful or stateless. Stateful failover is more reliable because when a load balancer fails, no TCP or Web sessions are lost. That's because the session table gets synchronized with the secondary device (in the active-standby model), or both devices are synchronized (in the active-active model). Stateful failover requires more hardware because mirroring sometimes decreases the number of concurrent sessions a device can handle.
Stateless failover, meanwhile, doesn't save existing sessions during the transition from a failed load balancer to a backup device, but it does re-establish those connections with the backup load balancer. So should you go stateful or stateless? That depends on how important in-progress TCP or Web sessions are to your business.
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