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A VDC identifies the nodes that are participating in an ECS instance. The first VDC must contain the nodes from the local ECS instance. Additional VDCs can then be configured, identifying all the nodes in that remote ECS instance. Adding remote VDCs to a local ECS instance creates the federation of ECS instances. To create a replication group that includes storage pools from a remote VDC, that remote VDC must be federated with the local VDC.
Generally, a physical site has one VDC. Some organizations have multiple VDCs per site—for example, one for engineering and one for operations—and can be federated together for ease of management. However, we do not recommend creating replication groups consisting of VDCs that are all in one local site to use the ECS XOR feature for storage efficiency. In such scenario, when a site is down, more than one VDC becomes unavailable.
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