# Understand OpenSearch Replication

Each Managed OpenSearch plan comes with a default visualization included in the OpenSearch Dashboards. The Dashboard interface is available as a second connection string from the service details - see the Connection Data in the Portal. Use this URL to connect to the visualization tool and start making queries and reports on your data.

The Managed OpenSearch plans have different replication factors:

- Hobbyist and Startup plans are single node based, so
    no replication factor is supported.
- For Business and Premium plans, the replication factor can be adjusted to
    your application requirements from 1 replica to N-1 replicas
    where N is the total number of nodes in your cluster.

The Managed OpenSearch database service will automatically adjust
the replication factor when the following conditions occur:

- If `number_of_replicas` is too large for the current cluster size, it is
    automatically lowered to the maximum possible value (the number of nodes on
    the cluster minus 1).
- If `number_of_replicas` is 0 on a multi-node cluster, it is automatically
    increased to 1.
- If `number_of_replicas` is between 1 and the maximum value, it is not adjusted.

When the replication factor (number_of_replicas value) is greater than the size
of the cluster, `number_of_replicas` is automatically lowered because it is not
possible to replicate index shards to more nodes than there are on the
cluster.