COORDINATION OF QUALITY OF SERVICE IN A MULTI-LAYER VIRTUALIZED STORAGE ENVIRONMENT

A system for coordination for quality of service in multi-layer storage virtualization environments includes a first, second and third storage entity at a respective first, second and third layer of virtualized storage. The first storage entity sends a request for an I/O task to the second storage entity. In response to the request, the second storage entity may be configured to cooperate with the third storage entity to perform one or more I/O operations to satisfy one or more quality of service requirements associated with the I/O task.