公开(公告)号：JP2007220112A

公开(公告)日：2007-08-30

申请号：JP2007028699

申请日：2007-02-08

Applicant: Internatl Business Mach Corp ,  インターナショナル・ビジネス・マシーンズ・コーポレーションInternational Business Maschines Corporation

Inventor： WOLFGANG JOHN JAY ,  BOYD KENNETH W ,  DAY KENNETH FAIRCLOUGH III ,  YUDENFRIEND HARRY MORRIS ,  EDEL STEPHEN F

IPC: G06F3/06 ,  G06F12/00

CPC classification number: G06F11/2094 ,  G06F11/2097

Abstract: PROBLEM TO BE SOLVED: To provide a device, a system and a method for switching volume address association in point-in-time copy relationship. SOLUTION: A migration module 320 copies data from a source volume 205 to a target volume 210. A detection module 310 detects data corruption of the source volume 205. A switching module 315 switches a logical volume address from a source volume address of the source volume 205 to a target volume address of the target volume 210 in response to detecting the data corruption to redirect reading/writing of the data to the target volume 210. In one embodiment, a tracking module 325 tracks the current target volume copy of source volume data to redirect access for the source volume data without the current target volume copy to the source volume. COPYRIGHT: (C)2007,JPO&INPIT

Abstract translation: 要解决的问题：提供一种在时间点复制关系中切换卷地址关联的设备，系统和方法。 解决方案：迁移模块320将数据从源卷205复制到目标卷210.检测模块310检测源卷205的数据损坏。切换模块315将逻辑卷地址从源卷地址 响应于检测到数据损坏将源卷205连接到目标卷210的目标卷地址，以将数据的读/写重定向到目标卷210.在一个实施例中，跟踪模块325跟踪当前目标卷副本 源卷数据重定向源卷数据的访问，而不将当前目标卷复制到源卷。 版权所有（C）2007，JPO＆INPIT

公开(公告)号：DE3855647T2

公开(公告)日：1997-05-07

申请号：DE3855647

申请日：1988-08-16

Applicant: IBM

Inventor： EDEL STEPHEN F ,  WORKMAN MICHAEL LEE ,  YAMAMOTO KENNETH GREGORY ,  YU MANTLE MAN-HON

IPC: G11B21/08 ,  G11B21/10

Abstract: A data recording disk file with a voice coil motor (VCM) actuator (40) and a digital servo control system for positioning the read/write heads (30, 32, 34, 36) to selected concentric data tracks includes means for calculating the factor relating acceleration of the heads (30, 32, 34, 36) to VCM input current. This permits each disk file to compensate for any variation in the nominal VCM physical parameters, thus enabling VCMs to be manufactured to less demanding tolerances. The disk file also calculates a unique acceleration factor for each head position during movement of the heads (30, 32, 34, 36) from one track to another, thereby improving the arrival time of the heads (30, 32, 34, 36) to the target track. During an initialization procedure, the disk file performs a track seek, during which VCM current and head velocity information are acquired and used by the microprocessor (80) in the digital servo control system to calculate a value representing an average actual acceleration factor unique to that disk file. This value, together with predetermined constants representing the characteristic relationship of acceleration factor to head position in a disk file with a nominal VCM, are used by the microprocessor (80) to calculate the actual acceleration factor for each head position during a track seek.

公开(公告)号：DE3855647D1

公开(公告)日：1996-12-12

申请号：DE3855647

申请日：1988-08-16

Applicant: IBM

Inventor： EDEL STEPHEN F ,  WORKMAN MICHAEL LEE ,  YAMAMOTO KENNETH GREGORY ,  YU MANTLE MAN-HON

IPC: G11B21/08 ,  G11B21/10

Abstract: A data recording disk file with a voice coil motor (VCM) actuator (40) and a digital servo control system for positioning the read/write heads (30, 32, 34, 36) to selected concentric data tracks includes means for calculating the factor relating acceleration of the heads (30, 32, 34, 36) to VCM input current. This permits each disk file to compensate for any variation in the nominal VCM physical parameters, thus enabling VCMs to be manufactured to less demanding tolerances. The disk file also calculates a unique acceleration factor for each head position during movement of the heads (30, 32, 34, 36) from one track to another, thereby improving the arrival time of the heads (30, 32, 34, 36) to the target track. During an initialization procedure, the disk file performs a track seek, during which VCM current and head velocity information are acquired and used by the microprocessor (80) in the digital servo control system to calculate a value representing an average actual acceleration factor unique to that disk file. This value, together with predetermined constants representing the characteristic relationship of acceleration factor to head position in a disk file with a nominal VCM, are used by the microprocessor (80) to calculate the actual acceleration factor for each head position during a track seek.

公开(公告)号：CA1317372C

公开(公告)日：1993-05-04

申请号：CA577642

申请日：1988-09-16

Applicant: IBM

Inventor： EDEL STEPHEN F ,  VAN PHAM ICH

IPC: G05B21/02 ,  G11B21/08 ,  G11B21/10 ,  G11B5/55 ,  G11B5/56

Abstract: A disk file digital servo control system incorporates means for measuring the time between samples of read/write head position error signals (PES), and uses a value of that measured time as part of the computation of the digital control signal. The digital servo control system has a microprocessor which runs a control signal algorithm, a portion of which is a state estimator for estimating the position, velocity and acceleration of the head. The state estimator requires the use of estimator constants determined from physical parameters of the disk file, including the PES sampling time. By using the actual measured PES sampling time, rather than a constant value of nominal PES sampling time, the estimator constants can be modified to improve the accuracy of the computed control signal. This results in improved performance of the control system to move the head to the target track whenever there are variations in the nominal PES sampling time caused by variations in the disk file drive motor speed.

公开(公告)号：DE3875439T2

公开(公告)日：1993-04-22

申请号：DE3875439

申请日：1988-08-09

Applicant: IBM

Inventor： EDEL STEPHEN F ,  PHAM VAN ICH

IPC: G05B21/02 ,  G11B21/08 ,  G11B21/10 ,  G11B5/55 ,  G11B5/56 ,  G11B5/54

Abstract: A disk file digital servo control system incorporates means for measuring the time between samples of read/write head position error signals (PES), and uses a value of that measured time as part of the computation of the digital control signal. The digital servo control system has a microprocessor which runs a control signal algorithm, a portion of which is a state estimator for estimating the position, velocity and acceleration of the head. The state estimator requires the use of estimator constants determined from physical parameters of the disk file, including the PES sampling time. By using the actual measured PES sampling time, rather than a constant value of nominal PES sampling time, the estimator constants can be modified to improve the accuracy of the computed control signal. This results in improved performance of the control system to move the head to the target track whenever there are variations in the nominal PES sampling time caused by variations in the disk file drive motor speed.

公开(公告)号：DE3875439D1

公开(公告)日：1992-11-26

申请号：DE3875439

申请日：1988-08-09

Applicant: IBM

Inventor： EDEL STEPHEN F ,  PHAM VAN ICH

IPC: G05B21/02 ,  G11B21/08 ,  G11B21/10 ,  G11B5/55 ,  G11B5/56 ,  G11B5/54

Abstract: A disk file digital servo control system incorporates means for measuring the time between samples of read/write head position error signals (PES), and uses a value of that measured time as part of the computation of the digital control signal. The digital servo control system has a microprocessor which runs a control signal algorithm, a portion of which is a state estimator for estimating the position, velocity and acceleration of the head. The state estimator requires the use of estimator constants determined from physical parameters of the disk file, including the PES sampling time. By using the actual measured PES sampling time, rather than a constant value of nominal PES sampling time, the estimator constants can be modified to improve the accuracy of the computed control signal. This results in improved performance of the control system to move the head to the target track whenever there are variations in the nominal PES sampling time caused by variations in the disk file drive motor speed.