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Can a config server be deployed as a replica set?
To deploy config servers as a replica set, the config servers must run the WiredTiger storage engine. In version 3.4, MongoDB removes support for SCCC config servers. The following restrictions apply to a replica set configuration when used for config servers: Must have zero arbiters.
How can I replicate my storage from one server to another?
In Windows Admin Center, navigate to Server Manager, and then select one of the servers. Navigate to Roles & Features. Select Features > Storage Replica, and then click Install. Repeat on the other server.
How to convert a standalone to a replica?
Use the –replSet option to specify the name of the new replica set. For example, the following command starts a standalone instance as a member of a new replica set named rs0. The command uses the standalone’s existing database path of /srv/mongodb/db0:
How big of a server do I need to replicate Windows Server?
Active Directory Domain Services forest (doesn’t need to run Windows Server 2016). Two servers running Windows Server 2019 or Windows Server 2016, Datacenter Edition. If you’re running Windows Server 2019, you can instead use Standard Edition if you’re OK replicating only a single volume up to 2 TB in size.
Do you use the same config server for different clusters?
Do not use the same config servers for different sharded clusters. Administrative operations conducted on config servers may have significant impact on sharded cluster performance and availability. Depending on the number of config servers impacted, the cluster may be read-only or offline for a period of time.
What happens when a config server loses its primary?
If the config server replica set loses its primary and cannot elect a primary, the cluster’s metadata becomes read only. You can still read and write data from the shards, but no chunk migration or chunk splits will occur until the replica set can elect a primary.
If all config servers become unavailable, the cluster can become inoperable. To ensure that the config servers remain available and intact, backups of config servers are critical. The data on the config server is small compared to the data stored in a cluster, and the config server has a relatively low activity load.