Content protection: replication

If an ILM rule’s content placement instructions require replicated copies of object data, copies are made and stored to disk by the Storage Nodes that make up the configured storage pool.

Data flow

The ILM engine in the LDR service controls replication and ensures that the correct number of copies are stored in the correct locations and for the correct amount of time.

diagram showing the process described in surrounding text

  1. The ILM engine queries the ADC service to determine the best destination LDR service within the storage pool specified by the ILM rule. It then sends that LDR service a command to initiate replication.
  2. The destination LDR service queries the ADC service for the best source location. It then sends a replication request to the source LDR service.
  3. The source LDR service sends a copy to the destination LDR service.
  4. The destination LDR service notifies the ILM engine that the object data has been stored.
  5. The ILM engine updates the metadata store with object location metadata.