HA

Single-AZ HA

Single-AZ deployment means to deploy an instance within a physical equipment room. DCS provides process/service HA, data persistence, and hot standby DR policies for different types of DCS instances.

Single-node DCS instance: When DCS detects a process fault, a new process is started to ensure service HA.

Figure 1 HA for a single-node DCS instance deployed within an AZ

Master/Standby DCS instance: Data is persisted to disk in the master node and incrementally synchronized and persisted to the standby node, achieving hot standby and data persistence.

Figure 2 HA for a master/standby DCS instance deployed within an AZ

Cluster DCS instance: Similar to a master/standby instance, data in each shard (instance process) of a cluster instance is synchronized between master and standby nodes and persisted on both nodes.

Figure 3 HA for a cluster DCS instance deployed within an AZ