Distributed storage resource reservation for replication, disaster recovery and data protection across multiple sites

A method includes: receiving, at a cluster controller of a first cluster, a request for pairing a first datastore of the first cluster to a second datastore of a second cluster, wherein each of the first cluster and the second cluster includes a plurality of datastores; determining whether the first datastore is available for pairing; in response to determining that the first datastore is available for pairing, generating an entry in a mapping table indicating that the first datastore is paired with the second datastore; receiving information associated with the second datastore; and in response to receiving the information, storing the information in the first datastore. The second cluster performs similar operations as those performed by the first cluster to achieve a bidirectional reservation between the first cluster and the second cluster.