Data Domain uses standard protocols to simplify administration and integration into existing networks. It can connect to systems either by fiber channel or Ethernet.
When using Fiber Channel, the DD uses Virtual Tape Library (VTL) to communicate with the backup server. When using Ethernet, the backup server will mount the DD like any other disk share using CIFS or NFS. DD can also use DDBoost, which requires software agent be installed on the client, and can also use NDMP which essentially is VTL over Ethernet instead of FC.
DD Replicator is a licensed feature, and when used on two DD appliances, replication and backup can take place simultaneously. VTL is also a licensed feature.
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