1. A storage system comprising: a memory storing a first given value as a system data protection level which is set to the storage system; and a processor being configured to logically partition the storage system into a plurality of namespaces, wherein the processor is configured to receive information to set, either a dynamic data protection level or a fixed data protection level with a second given value, for a namespace in the plurality of namespaces, determine whether the namespace has the dynamic data protection level or the fixed data protection level, and set the first given value as the data protection level of the namespace if the namespace has the dynamic data protection level, and the set second given value as the data protection level of the namespace if the namespace has the fixed data protection level.