Patent ID: 8230192

Claim:
A method for providing Quality of Service (QoS)-based storage tiering and migration in a storage system, said method comprising: monitoring an application process when the application process is accessing a first storage tier of the storage system; based on said monitoring, determining a QoS factor measurement of the application process; comparing the QoS factor measurement to at least one of: a first pre-determined QoS factor threshold and a second pre-determined QoS factor threshold; and when said comparing indicates that the QoS factor measurement is greater than the first pre-determined QoS factor threshold, creating a Point-in-Time (PiT) copy and establishing an access permission of the PiT copy as Read Only, wherein the PiT copy is based upon the first storage tier, when said comparing indicates that the QoS factor measurement is less than the first pre-determined QoS factor threshold and greater than the second pre-determined QoS factor threshold, migrating data from the PiT copy to a second storage tier.