DRBD provides Block level replication and can be Synchronous or Asynchronous. It provides the lowest level of replication between two (or more) systems. In short it replicates disk blocks as they are modified, over the network the the receiving system. This type of replication is particularly useful for a true HA zero data loss scenario. Consider this option if your business requirements include:
This service provides configuration of a single primary and a single secondary. This service does not include the configuration of auto-failover. Automatic failover configuration may be purchased separately. This service assumes available disk space for reconfiguration.
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