A storage system comprises a storage array controller and a storage array, which includes multiple storage devices and storage device controllers. The storage array controller initiates scrubbing operation commands on data stored within a first data range using a first level of checksums for that data...http://www.google.de/patents/US20020162076?utm_source=gb-gplus-sharePatent US20020162076 - Storage array employing scrubbing operations using multiple levels of checksums
