Patent ID: 8566635
Filing Date: 2013-10-22
Classification: G06F

Abstract:
1. A system comprising: a primary storage system, the primary storage system comprising: a secondary storage system, the secondary storage system comprising: a replication communication link coupling the primary storage controller with the secondary storage controller, wherein a logical volume is defined within both the primary storage system and the secondary storage system, the logical volume having an associated logical volume device identifier common to both the primary storage controller and the secondary storage controller, wherein the secondary storage system is adapted to process a write I/O request directed to the logical volume device identifier from an attached host system by shipping, via the replication link, the write I/O request to the primary storage controller for processing by the primary storage system, wherein the primary storage system is adapted to process a write I/O request directed to the logical volume device identifier received from an attached host system or received from the secondary storage system by storing write data on the primary physical storage volume and transferring the data to the secondary storage controller, via the replication link, to be stored on the secondary physical storage volume.