Abstract: A method, system, and computer program product for providing a first site the ability to execute a read signature command, wherein the read signature command takes a set of arguments, wherein at least one of the arguments corresponds to at least a portion of the first storage medium, and returns a signature value for the at least a portion of the storage medium.

Abstract: In one aspect, a method includes generating a write signature command. The write signature command is configured to write a signature to an offset in a storage array without data and to enable the storage array to write the data with the same signature to a volume if the data is available at the storage array.

Abstract: A method is used in managing deduplication density. A deduplication density of a data object is determined. The deduplication density is indicated by a number of deduplicated data objects represented by the data object. Based on the deduplication density of the data object, the data object is skipped for applying a deduplicating technique to the data object. An association is created between the data object and another data object. The other data object is used for applying the deduplicating technique where contents of the other data object are identical to contents of the data object.

Abstract: A method is used in managing deduplication density. A deduplication density of a data object is determined. The deduplication density is indicated by a number of deduplicated data objects represented by the data object. Based on the deduplication density of the data object, a deduplicating technique is applied to the data object.

Abstract: A method is used in managing compression in data storage systems. A data temperature is determined for a set of data in a block-based data storage system. Based on the data temperature, data compression is applied to the set of data.

Abstract: The invention provides a system to reclaim space identified as no longer in use and comprises a vLUN, a thinly provisioned mapped LUN, a mapping layer, and a data reduction engine. Chunks of data are stored at logical chunk addresses (LCAs) in the vLUN and are mapped to corresponding physical chunk addresses (PCAs) in the thinly provisioned mapped LUN. The data reduction engine performs a data reduction process on a first logical chunk of data stored at a first LCA in the vLUN, where the first logical chunk has a size that is a nonzero integer multiple of the size of the storage extent of the thinly provisioned mapped LUN. After the data reduction process, the PCA associated with the first logical chunk is no longer needed, and the thinly provisioned mapped LUN is instructed to deallocate the PCA associated with the first logical chunk that is no longer needed.

Abstract: The invention provides a system to reclaim space identified as no longer in use and comprises a vLUN, a thinly provisioned mapped LUN, a mapping layer, and a data reduction engine. Chunks of data are stored at logical chunk addresses (LCAs) in the vLUN and are mapped to corresponding physical chunk addresses (PCAs) in the thinly provisioned mapped LUN. The data reduction engine performs a data reduction process on a first logical chunk of data stored at a first LCA in the vLUN, where the first logical chunk has a size that is a nonzero integer multiple of the size of the storage extent of the thinly provisioned mapped LUN. After the data reduction process, the PCA associated with the first logical chunk is no longer needed, and the thinly provisioned mapped LUN is instructed to deallocate the PCA associated with the first logical chunk that is no longer needed.

Abstract: A system configured to optimize access to stored chunks of data is provided. The system comprises a vLUN layer, a mapped LUN layer, and a mapping layer disposed between the vLUN and the mapped LUN. The vLUN provides a plurality of logical chunk addresses (LCAs) and the mapped LUN provides a plurality of physical chunk addresses (PCAs), where each LCA or PCA stores a respective chunk of data. The mapping layer defines a layout of the mapped LUN that facilitates efficient read and write access to the mapped LUN.

Abstract: A method, system, or computer program product for controlling access to software component features is disclosed. There are three available states for selectable component features. The three available states, of which one is selected, are: (i) enabled access to the selected software component features for users and other software component features on a data storage system, (ii) enabled access to the selected software component features by other software component features on a data storage system, or (iii) disabled access to the software component features.

Abstract: A method, system, or computer program product for controlling software installation that can accommodate revisions of software and hardware platforms over time.