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    5.
    发明专利
    未知

    公开(公告)号：DE69021143D1

    公开(公告)日：1995-08-31

    申请号：DE69021143

    申请日：1990-05-21

    Applicant: IBM

    Inventor： PENCE JERRY WAYNE

    IPC: G06F3/06 ,  G11B20/00 ,  G11B20/10 ,  G06F13/00

    Abstract: A method for efficiently utilizing data recording media in a data processing system performing data compression beneath the level of the host processor is disclosed. To improve the ability of a recording media to be copied without increasing host processor overhead, the control unit which sees the compressed data is checked only upon recording a predetermined amount of uncompressed data. At such time, a compression ratio is calculated for the current data set and is used to monitor the recording of the remaining data of the current data set in compressed form. When a predetermined amount of compressed data is estimated to be recorded, the predetermined amount being the minimum storage capacity of a recording media, recording begins on a new recording media. Recording media spanning is reduced by checking counters in the storage device control unit only upon completion of recording an entire data set, and then using the uncompressed size of the next data set to be recorded to determine whether or not to continue recording on the same or a new cartridge.

    6.
    发明专利
    未知

    公开(公告)号：DE69031862D1

    公开(公告)日：1998-02-05

    申请号：DE69031862

    申请日：1990-10-22

    Applicant: IBM

    Inventor： MCBRIDE GREGORY EDWARD ,  PENCE JERRY WAYNE ,  VAN HISE DAVID GREGORY

    IPC: G06F3/06 ,  G06F9/50 ,  G06F13/14 ,  G06F13/12 ,  G06F9/46

    Abstract: A method for balancing the loads on channel paths in a digital computer during long running applications is disclosed. Only the load associated with relatively long running applications is monitored. For each volume of data eligible for processing, the selection of volumes is first made from those having affinity to the calling host. The load across the respective connected channel paths is calculated. The calculation is weighted to account for the different magnitudes of load resulting from different applications and to prefer the selection of volumes connected to the fewest unused channel paths such that processing of the selected volume will maintain the maximum number of unused channel paths. The optimal volume is selected as the next volume to be processed. The monitored load on each channel path is then updated to include the load associated with the newly selected volume, assuming that the load associated with processing the volume is distributed evenly across the respective connected channel paths. The selection of the following volume is then based on the updated load information and the method continues cyclically during subsequent selection of the remaining volumes for processing.

    7.
    发明专利
    未知

    公开(公告)号：DE3587398T2

    公开(公告)日：1993-12-09

    申请号：DE3587398

    申请日：1985-01-02

    Applicant: IBM

    Inventor： BEGLIN THOMAS WILLIAM ,  BITTIHOFFER JANE REID ,  KAMIONKA HARVEY ELMER ,  PENCE JERRY WAYNE

    IPC: G06F3/06 ,  G06F12/00 ,  G06F12/08

    Abstract: © A storage-management system executable in one host or simultaneously in a plurality of hosts (10, 11), manages concurrently executing migration (28), recall (27), and recycle (30) (such as defragmentation) tasks. Accesses to data storage volumes (14-18) (tape, disks, etc.) are managed in accordance with predetermined contention resolution procedures and priorities. Certain tasks are non-interruptible.

    9.
    发明专利
    未知

    公开(公告)号：DE3587398D1

    公开(公告)日：1993-07-22

    申请号：DE3587398

    申请日：1985-01-02

    Applicant: IBM

    Inventor： BEGLIN THOMAS WILLIAM ,  BITTIHOFFER JANE REID ,  KAMIONKA HARVEY ELMER ,  PENCE JERRY WAYNE

    IPC: G06F3/06 ,  G06F12/00 ,  G06F12/08

    Abstract: © A storage-management system executable in one host or simultaneously in a plurality of hosts (10, 11), manages concurrently executing migration (28), recall (27), and recycle (30) (such as defragmentation) tasks. Accesses to data storage volumes (14-18) (tape, disks, etc.) are managed in accordance with predetermined contention resolution procedures and priorities. Certain tasks are non-interruptible.

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