Abstract: A method of performing deduplication includes (1) receiving a write command that specifies a set of data, the set of data including multiple blocks of data, (2) hashing a subset of the set of data, yielding a representative digest of the set of data, and (3) performing deduplication on the set of data based at least in part on matching the representative digest to a digest already stored in a database which relates digests to locations of data from which the digests were produced. An apparatus, system, and computer program product for performing a similar method are also provided.

Abstract: A method of performing deduplication includes (1) receiving a write command that specifies a set of data, the set of data including multiple blocks of data, (2) hashing a subset of the set of data, yielding a representative digest of the set of data, and (3) performing deduplication on the set of data based at least in part on matching the representative digest to a digest already stored in a database which relates digests to locations of data from which the digests were produced. An apparatus, system, and computer program product for performing a similar method are also provided.

Abstract: Technology for dynamically adjusting a process scheduler in a storage processor of a data storage system. An average amount of host data contained in sets of host data processed by host I/O request processing threads is calculated. An average amount of time required for each host I/O request processing thread to execute to completely process the average amount of host data contained in a set of host data is also calculated. Operation of the process scheduler in the storage processor is then adjusted to cause the process scheduler to subsequently allocate the processor in the storage processor to host I/O request processing threads in timeslices having a duration that is at least as large as the average amount of time required for each host I/O request processing thread to execute to completely process the average amount of host data contained in a set of host data.

Abstract: A data storage system has a chassis and a pair of printed circuit boards disposed in the chassis. Each one of the pair of printed circuit boards has disposed thereon a processor, a translator controlled by the processor, a SAS expander having a bidirectional front end port and multiple bidirectional backend ports, and an expansion port, and a SAS controller coupled between the translator and the expander. The system also has an interposer printed circuit board disposed in the chassis, and multiple multiplexers disposed on the interposer printed circuit board. Each one of the multiplexers has a pair of bidirectional front end ports and a pair of bidirectional back end ports. A first one of the pair of bidirectional front end ports is connected to a corresponding backend port of the SAS expander disposed on a first one of the pair of storage processor printed circuit boards.

Abstract: A data storage system has a chassis and a pair of printed circuit boards disposed in the chassis. Each one of the pair of printed circuit boards has disposed thereon a processor, a translator controlled by the processor, a SAS expander having a bidirectional front end port and multiple bidirectional backend ports, and an expansion port, and a SAS controller coupled between the translator and the expander. The system also has an interposer printed circuit board disposed in the chassis, and multiple multiplexers disposed on the interposer printed circuit board. Each one of the multiplexers has a pair of bidirectional front end ports and a pair of bidirectional back end ports. A first one of the pair of bidirectional front end ports is connected to a corresponding backend port of the SAS expander disposed on a first one of the pair of storage processor printed circuit boards.