The invention provides a garbage recycling method. The storage
system determines a first time period according to the business pressure value of the storage
system in the historical time period, where the business pressure value of the storage
system in the first time period is lower than a set threshold value, and the business pressure value of the storage system in the historical time period is obtained according to any one or more of
IOPS, IO size, data read-write proportion, deduplication compression proportion and
throughput; therefore, the storage system can carry out
garbage collection in the first time period with the small business pressure value. Therefore, the storage system can have more blank
logic block groups to support the storage system to quickly write a large amount of new data in other time periods, so that the influence of
garbage collection in the other time periods on the
IOPS and other performances of the host can be reduced, and the performance of the host when the host has a large amount of data write-in tasks is improved. In addition, the embodiment of the invention further provides a garbage recycling device.