ATTO XstreamCORE™ is an external storage controller that allows IT administrators to decouple their direct-attached external SAS storage and present the storage as part of the Fibre Channel fabric to multiple hosts. XstreamCORE storage controllers reduce live migration time by eliminating the need to migrate data. When a storage area network (SAN) is created using XstreamCORE, all physical hosts can see the storage on which virtual machines reside. This removes the need to migrate the Virtual Machines' data. The system state is the sole data that is required to be migrated by VMware vSphere® vMotion®.