Post-failover data synchronization

Data that is collected by a primary high-availability (HA) host, up to the point of failover, is maintained virtually, in real time, by the secondary HA host.

When the primary HA host is restored after a failure, only the data that is collected by the secondary HA host in the intervening period is synchronized with the primary HA host. Therefore, post-failover disk synchronization is faster than initial disk synchronization, unless the disk on the primary HA host was replaced or reformatted when the host was manually repaired.

When restored from a failover, the status of the primary HA host becomes offline. You must set the primary HA host to an online state, and set the secondary host to an offline state, before it can become the active host. Disk replication with the secondary HA host is enabled while the primary HA host remains offline.