WRITE SET BOUNDARY MANAGEMENT FOR HETEROGENEOUS STORAGE CONTROLLERS IN SUPPORT OF ASYNCHRONOUS UPDATE OF SECONDARY STORAGE

摘要

A data storage system including at least one storage controller having a firstcolor policy and operative to store data onto a first data storage unit at aprimary site as part of a current color of the primary site, at least onestorage controller having a second color policy and operative to store dataonto a second data storage unit at the primary site as part of the currentcolor, and a color control node operative to provide each of the controllerswith new color information while maintaining the integrity of dependent writesacross color boundaries.