Planning Cluster AZs and HA
An availability zone (AZ) is a physical region where resources use independent power supplies and networks. AZs in the same region can communicate with each other through internal networks but are physically isolated.
Multi-AZ deployment is a high availability feature provided by CSS. Deploying a cluster across two AZs located in the same region can help prevent data loss and lower the possibility of service outages.
Suggestions on Multi-AZ Deployment
If you select multi-AZ deployment when creating a cluster, CSS automatically enables cross-AZ HA to ensure that cluster nodes will be evenly distributed across the selected AZs (the difference between the number of nodes in each AZ cannot exceed 1).
A Logstash cluster can span a maximum of two AZs.
Node Distribution Rules
When a multi-AZ cluster is created, nodes of all types are evenly distributed across different AZs. A maximum of two AZs can be used. Table 1 shows the node distribution when the number of AZs varies.
When creating a multi-AZ cluster, select at least two nodes. Otherwise, multi-AZ cluster deployment will fail.
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