State information indicates wear levels of respective storage devices and free spaces in the respective storage devices. In response to receiving a request for allocating storage space to the storage system from the storage resource pool, corresponding available spaces in the respective storage devices are determined on the basis of the wear level and the free spaces of the respective storage devices, here the corresponding available spaces represent storage spaces in the respective storage devices which are allocatable to the storage system. A group of storage devices are selected from a plurality of storage devices on the basis of the corresponding available spaces. Requested storage spaces are allocated to the storage system from available spaces in the group of storage devices. Thereby, wear levels of various storage devices in the resource pool may be balanced, and further the overall life of the resource pool may be prolonged.