Storage volume addition to synchronized read/write accessible storage systems

Abstract

Two storage arrays, a primary storage array and a remote storage array, are configured to implement a remote data replication facility, in which both the storage arrays are active, such that hosts can both read and write data to both the primary storage array and remote storage array. If the host would like to add storage, the host sends a command to one of the storage arrays to add a storage volume. The first storage array that receives the command locally creates the requested storage volume and coordinates with the second storage array to also locally create the requested storage volume. While the storage volumes are being created and formatted, the first and second storage arrays coordinate status responses to the host. Once the requested storage volumes is ready on both storage arrays, the storage volume is made accessible to the host on both storage arrays.