3 copies

Author: spelluru

articles/service-bus-messaging/service-bus-outages-disasters.md

@@ -30,7 +30,7 @@ Service Bus Premium supports Geo-disaster recovery, at the namespace level. For
 
 ### Availability Zones
 
-The Service Bus Premium SKU supports [Availability Zones](../availability-zones/az-overview.md), providing fault-isolated locations within the same Azure region.
+The Service Bus Premium SKU supports [Availability Zones](../availability-zones/az-overview.md), providing fault-isolated locations within the same Azure region. Service Bus manages three copies of messaging store (1 primary and 2 secondary). Service Bus keeps all the three copies in sync for data and management operations. If the primary copy fails, one of the secondary copies is promoted to primary with no perceived downtime. If the applications see transient disconnects from Service Bus, the retry logic in the SDK will automatically reconnect to Service Bus. 
 
 > [!NOTE]
 > The Availability Zones support for Azure Service Bus Premium is only available in [Azure regions](../availability-zones/az-overview.md#services-support-by-region) where availability zones are present.