Data deduplication with reduced hash computations

A data storage system, comprising:

• an interface node coupled to one or more data storage devices of the data storage system, wherein the interface node is configured to:
• compare a first attribute of a received data page to one or more corresponding first attributes of one or more data pages stored in the storage system;
• in response to the first attribute of the received data page not being the same as one or more of the first attributes, store the received data page in the storage system;
• in response to the first attribute being the same as one or more of the first attributes, compare a second attribute of the received data page to one or more corresponding second attributes of the one or more data pages stored in the storage system;
• in response to the second attribute of the received data page not being the same as one or more of the second attributes, store the received data page in the storage system;
• in response to the second attribute of the received data page being the same as one or more of the second attributes, compare a fingerprint of the received data page to one or more fingerprints of the one or more data pages stored in the storage system, wherein generating the first and second attributes of the received data page is less computationally expensive than generating the fingerprint of the received data page;
• in response to the fingerprint of the received data page not being the same as one or more of the fingerprints, store the received data page in the storage system;
• and
• in response to the fingerprint of the received data page being the same as one or more of the fingerprints, replace the received data page with a reference to a corresponding data page included in the one or more data pages stored in the storage system and discard the received data page, wherein the first attribute corresponds to a cyclic redundancy check (CRC) value, the second attribute corresponds to a compressed page size, and the interface node is further configured to:
• generate the CRC value for the received data page;
• and in response to the CRC value of the received data page being the same as a CRC value of one of the data pages stored in the storage system, compress the received data page to generate the compressed page size.

A computer program product, the computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions executable by a controller, to cause the controller to:

• compare a first attribute of a received data page to one or more corresponding first attributes of one or more data pages;
• in response to the first attribute of the received data page not being the same as one or more of the first attributes, store the received data page;
• in response to the first attribute being the same as one or more of the first attributes, compare a second attribute of the received data page to one or more corresponding second attributes of the one or more data pages stored in the storage system;
• in response to the second attribute of the received data page not being the same as one or more of the second attributes, store the received data page in the storage system;
• in response to the second attribute of the received data page being the same as one or more of the second attributes, compare a fingerprint of the received data page to one or more fingerprints of the one or more data pages stored in the storage system, wherein generating the first and second attributes of the received data page is less computationally expensive than generating the fingerprint of the received data page;
• in response to the fingerprint of the received data page not being the same as one or more of the fingerprints, store the received data page;
• and
• in response to the fingerprint of the received data page being the same as one or more of the fingerprints, replace the received data page with a reference to a corresponding data page included in the one or more data pages and discard the received data page, wherein the first attribute corresponds to a cyclic redundancy check (CRC) value, the second attribute corresponds to a compressed page size, and the program instructions further cause the controller to:
• generate the CRC value for the received data page;
• and in response to the CRC value of the received data page being the same as a CRC value of one of the data pages stored in the storage system, compress the received data page to generate the compressed page size.