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Disk-drive-controller-accepting-first-commands-for-accessing-composite-drives-and-second-commands-for-individual-diagnostic-drive-control-wherein-commands-are-transparent-to-each-other

Data processing system with mixed media memory packs

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Self-timing optic lathe

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Data exchange system comprising a plurality of user terminals each containing a chip card reading device

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Sighter's protective helmet

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Method for authenticating messages passed between tasks

OF THE PREFERRED EMBODIMENT The preferred embodiment of the present invention is implemented to ...

Mechanism for determining actual physical topology of network based on gathered configuration information representing true neighboring devices

The foregoing needs, and other needs and objects that will become apparent from the following ...

System model determination for failure detection and isolation, in particular in computer systems

It is therefore an object of the present invention to facilitate the provision of system models to ...

Automated handling system for bank deposit boxes

I claim: 1. In a system for the automatic programmed handling of coded safety deposit boxes and ...

Determination of status of storage cells in an automated storage and retrieval system

In view of the foregoing, it is an object of the present invention to positively identify each ...

Device for playing back disks

It is an object of the present invention to provide a disk playback mechanism that overcomes the ...

Disk drive controller accepting first commands for accessing composite drives and second commands for individual diagnostic drive control wherein commands are transparent to each other

Details

Inventors: Parks, Terry J.; Jeffries, Kenneth L.; Jones, Craig S.;
Assignee: Dell USA, L.P. (Austin, TX)
Primary Examiner: Lee; Thomas C.
Assistant Examiner: Kim; Sang Hui
Attorney, Agent or Firm: Hood; Jeff, Huffman; James

A disk drive array with a controller which provides: dynamic remapping for grown defects in the disk drives, multi-thread request processing with a variable number of forkings, defect tracking with both logical and physical lists, guarded writes of less than a full stripe optimized by selectably using the redundancy to limit the number of sectors involved, association of multiple operations with a single disk request in order to facilitate error handling, use of an access hiatus as indication of further opportunity to rebuild data in background, and scatter/scatter (bidirectional scatter/gather) operations.

DETAILED DESCRIPTION S Mass Storage Disk Drives Risk of Failure Disk Arrays ("RAID") Queuing Access Requests Innovative Disk Array System Dynamic Sector Rexnapping Fork/Join/Remain for Request Synchronization Dual-Queue/Semaphore Global Resource Protection Dual Defect Lists Dynamic RMW Read Minimization Request Decomposition to Allow Error Handling Fragmentation to Atomic Operations Delay Strategy for Improved Responsiveness of Background Restores: Emulation of a Software Interface (INT13) in Hardware Self-Assignment of Handles Scatter/Scatter Read/Write Requests Firmware Patching Read-Ahead to Accommodate Multi-Thread Host Processor Periodic Activation of Physical Drives Majority Voting to Select Among Valid Records Physical Mode Synchronization of Physical Mode (PM) Commands with Logical (CDD) Commands (18) Rudimentary PM Command Set Primitive PM Command Set Interface Co-Residence

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