The diagram below illustrates storage server's failover architectures with Double-Take data replication for data protection and recoverability. In this example, the Secondary Digiliant Windows Storage Server stores a duplicate copy of the data residing on the Primary Digiliant Windows Storage Server. Data is automatically and asynchronously replicated from the Primary to Secondary Storage Server using Double-Take. Double-Take's highly efficient replication engine allows the Secondary Storage to be located at primary facility or at a remote disaster recovery site.
In the event of the failure of the Primary Storage Server the duplicate copy of all data maintained on the Secondary Storage Server can be used to restore critical services. Double-Take only copies the bytes change for each write request; if a user makes a 250-byte change to a file, only 250 bytes of data is copied, not the 32-128KB actually used as the chunk size on the underlying Raid storage system. Double-Take is able to distinguish between file reads and file writes, so it only replicates write operations to the Secondary Storage Server. This high availability storage solution simply provides the power and protection companies need to stay on top of their data.
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