Method and system for setting adaptive QoS (Quality of Service) of cloud hard disk

A self-adaptive QoS setting method and system for a cloud hard disk belongs to the field of cloud computing, and comprises the following steps: putting a QoS strategy of the cloud hard disk into a QoS management queue with a corresponding priority according to the priority of a service virtual machine corresponding to the cloud hard disk; the QoS strategy comprises set values of all QoS indexes of the cloud hard disk; when it is judged that the load of the storage cluster is higher than the preset upper limit, the reference values of the marking strategies in the QoS management queue are sequentially reduced from low to high according to the priority of the QoS management queue; when it is judged that the load of the storage cluster is lower than a preset lower limit, the reference values of the marking strategies in the QoS management queue are sequentially increased from high to low according to the priority of the QoS management queue; the marking strategy is a QoS strategy when the real-time value reaches