Hello dear colleagues!

Our customer tested failover for synchronous replication for two Unity 400. Customer simulated planned switchover between sites. Customer made "Failover" command and, after this he made "set -pause no" for start of replication in backward direction. Failover  was finished correctly but pair status is Out-of-sync and Syncing process has been started as FULL. For group LUN with size 1TB per LUN this process took more than one hour of time.

Could somebody explain to me is this "works as designed" or I should open an SR?