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    Record locate apparatus for variable length records on magnetic disk units
    1.
    发明授权
    Record locate apparatus for variable length records on magnetic disk units 失效
    记录磁悬浮单元可变长度记录的位置设备

    公开(公告)号：US3629860A

    公开(公告)日：1971-12-21

    申请号：US3629860D

    申请日：1969-11-10

    Applicant: IBM

    Inventor： CAPOZZI ANTHONY J

    IPC: G06F3/06 ,  G11B27/10 ,  G11B13/00

    CPC classification number: G06F3/0601 ,  G06F2003/0692 ,  G11B27/105 ,  G11B2220/20 ,  G11B2220/2516

    Abstract: Improved control apparatus which is independent of record format frees the channel of a central processor and/or the disk storage control unit connected to the channel until a read/write head and disk are relatively positioned for transfer of a selected record with minimum delay. In data processing systems having a plurality of magnetic disk drive units controlled by a common storage control unit, the improved apparatus determines the order in which selected variable length record positions on disks carried by the drive units become available to their respective read/write heads and renders the control unit effective to read or write a record only when that record is immediately available to its read/write head. In one arrangement the improved apparatus determines the length of time required for each selected record position to reach its respective read/write head and in the event that considerable delay will be encountered, it frees the channel and control unit for other processing work during the delay.

    INTEGRATED MULTILEVEL STORAGE HIERARCHY FOR A DATA PROCESSING SYSTEM
    5.
    发明专利
    INTEGRATED MULTILEVEL STORAGE HIERARCHY FOR A DATA PROCESSING SYSTEM 未知

    公开(公告)号：CA1123964A

    公开(公告)日：1982-05-18

    申请号：CA335621

    申请日：1979-09-14

    Applicant: IBM

    Inventor： CAPOZZI ANTHONY J

    IPC: G06F12/08 ,  G06F9/06

    Abstract: two-level storage hierarchy for a data processing system is directly addressable by the main processor. The two-level storage includes a high speed, small cache with a relatively slower, much larger main memory. The processor requests data from the cache and when the requested data is not resident in the cache, it is transferred from the main memory to the cache and then to the processor. The data transfer organization maximizes the system throughput and uses a single integrated control to accomplish data transfers. EN978013

    INTEGRATED MULTILEVEL STORAGE HIERARCHY FOR A DATA PROCESSING SYSTEM WITH IMPROVED CHANNEL TO MEMORY WRITE CAPABILITY
    7.
    发明专利
    INTEGRATED MULTILEVEL STORAGE HIERARCHY FOR A DATA PROCESSING SYSTEM WITH IMPROVED CHANNEL TO MEMORY WRITE CAPABILITY 未知

    公开(公告)号：CA1124888A

    公开(公告)日：1982-06-01

    申请号：CA341314

    申请日：1979-12-06

    Applicant: IBM

    Inventor： CAPOZZI ANTHONY J

    IPC: G06F12/04 ,  G06F12/08 ,  G06F9/40

    Abstract: INTEGRATED MULTILEVEL STORAGE HIERARCHY FOR A DATA PROCESSING SYSTEM WITH IMPROVED CHANNEL TO MEMORY WRITE CAPABILITY A data processing system including at least one channel and a multilevel store has the capability of performing a channel write to main memory where the data to be written into main memory crosses a double word boundary in a partial write store. The partial write store is accomplished by a merge operation which takes place in the memory system in a manner such that the main processor, channel and a cache store are freed up for further operation prior to the completion of the write to main memory. EN978021

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