Abstract: Deduplicated data storage is provided by presenting a virtual volume mapped by a translation table to a physical volume of a physical data storage system. The translation table maps sets of ranges of duplicate data blocks of the virtual volume to corresponding individual ranges of shared data blocks of the physical volume. A hash table for identifying duplicate data is indexed by a portion of a hash value calculated from newly written data blocks, and has entries each identifying an address alignment of the corresponding data block. In operation, existing entries are replaced with new entries for colliding data blocks having better address alignment, promoting wider address-space separation of the entries. Upon occurrence of a hit in the hash table, for a given data block in a range of newly written data blocks, data blocks of the range are compared to corresponding blocks in a range identified by the hit to maximize a size of a region to be identified by the translation table as duplicate data.

Abstract: Deduplicated data storage is provided by presenting a virtual volume mapped by a translation table to a physical volume of a physical data storage system. The translation table maps sets of ranges of duplicate data blocks of the virtual volume to corresponding individual ranges of shared data blocks of the physical volume. A hash table for identifying duplicate data is indexed by a portion of a hash value calculated from newly written data blocks, and has entries each identifying an address alignment of the corresponding data block. In operation, existing entries are replaced with new entries for colliding data blocks having better address alignment, promoting wider address-space separation of the entries. Upon occurrence of a hit in the hash table, a range of data blocks are compared to maximize a size of a region to be identified by the translation table as duplicate data.

Abstract: The polymer composition is used for packing products of the chemical, food and other industries. The packing material obtained from the polymer composition has a wide range of application and controllable decomposition of the packages in water medium, ensuring environmental cleanness and recycling of the material. The polymer composition for packing materials contains polyvinylalcohol and water, and, according to the invention, it also contains polyvinylacetate dispersion, methylcellulose, carboxymethylcellulose and glucose in the following proportions of the components in % by weight: polyvinylalcohol 32-84, polyvinylacetate dispersion 10-57, methylcellulose 3.0-5.8, carboxymethylcellulose 2.0-4.2, glucose 0.5-2.3, and water 0.5-6.0. The method for producing packing materials from the polymer composition includes the preparation of a dry mixture or viscous mass and moulding.