Hewlett-Packard Development Company, L.p.

Hewlett Packard Enterprise Development LP

Christopher Martin

Andrew Damian Topham

Curtis C Ballard

Robert C Elliott

Mark Aris

A method, system and computer readable medium for presenting unique Serial Attached Small computer system interface (SAS) target devices through a single target device. The method includes embedding a SAS protocol chip within an initiator-connectable device, the SAS protocol chip having storage for at least two SAS addresses and configured to select a single address, loading two or more SAS addresses into the SAS protocol chip, and mapping a respective SAS address to one of the unique target devices. The system includes a SAS protocol chip having storage for at least two SAS addresses and a method for selecting a single SAS address, and a processor unit connected to the SAS protocol chip by an interface bus, the processor configured to load two or more identifier addresses into the SAS protocol chip. The computer readable medium contains instructions that cause a processor to perform the described methods.

System and method for presenting devices through an SAS initiator-connected device

According to one aspect of embodiments of the present invention there is provided apparatus comprising a main assembly having a processing element configured to: obtain a first and second sub-assembly identifier stored on a second-assembly in communication with the main assembly; and enable operation of the main assembly and second assembly based on a determination that the first and second sub-assembly identifiers are cryptographically related.

Apparatus and method to enable operation between a main assembly and a sub-assembly that are cryptographically related

Techniques for processing tape storage include determining a current position of a read device to read a data block from a tape storage medium having a plurality of duplicate data areas, receiving a request to read a data block from the tape storage medium, and reading the requested data block from a duplicate data area from among the plurality of duplicate data areas that is nearest the current position of the read device.

Tape storage processing

A backup method relies on a single secondary storage device, such as a tape storage device, which emulates multiple secondary storage devices. The emulated secondary storage devices are coupled to data sources. Data which is received from the data sources is tagged with respective unique identifiers, interleaved and stored on a removable storage medium, such as a tape. This facilitates maximum usage of the media access bandwidth of the single secondary storage device.

Method of storing data on a secondary storage device

A tape drive unit has a data compression engine coupled to an incoming data stream. A buffer memory stores data of the incoming data stream. A control module enables or disables the data compression engine in response to a function of the data occupancy level of the buffer memory.

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Bath, United Kingdom

Christopher Martin