HCP System Management Help


Replication

Replication is the process of keeping selected tenants and buckets in two or more HCP systems in sync with each other. Basically, this entails copying object creations, deletions, and metadata changes between systems. HCP also replicates tenant and bucket configurations, and user accounts.

A replication topology is a configuration of HCP systems that are related to each other through replication. Typically, the systems in a replication topology are in separate geographic locations and are connected by a high-speed wide area network.

You can read from buckets on all systems to which those namespaces are replicated. The replication configuration set at the system level determines on which systems you can write to buckets.

Replication has several purposes, including:

If one system in a replication topology becomes unavailable (for example, due to network issues), another system in the topology can provide continued data availability.

If one system in a replication topology suffers irreparable damage, another system in the topology can serve as a source for disaster recovery.

If multiple HCP systems are widely separated geographically, each system may be able to provide faster data access for some applications than the other systems can, depending on where the applications are running.

If an object cannot be read from one system in a replication topology (for example, because a node is unavailable), HCP can try to read it from another system in the topology. Whether HCP tries to do this depends on the bucket configuration.

If a system that participates in a replication topology is unavailable, HTTP requests to that system can be automatically serviced by another system in the topology. Whether HCP tries to do this depends on the bucket configuration.

Note: Not all HCP systems support replication. In a system that supports replication, whether any given tenant or bucket is replicated depends on the replication configuration.

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