Global-active device is a data-mirroring technology of the Hitachi Storage Virtualization Operating System. Copies can be stored at two locations and because they are active/active, both copies can be read from and written to simultaneously. Global-active device enables a virtual storage machine that provides a logical abstract layer that hides the physical attributes of the […]

Global-active device is a data-mirroring feature of Hitachi Storage Virtualization Operating System. During a site disaster or with certain component failures, global-active device requires a tie-breaker of sorts to maintain data consistency between the two copies. This is the role of the quorum disk, which is simply a small volume on a third array, or […]