Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method and system for incremental time zero backup copying of data

a backup copying and data technology, applied in the field of incremental time zero backup copying of data, can solve the problems of requeuing data, affecting and high cost of backing up data within datasets, so as to maintain the availability of datasets

Inactive Publication Date: 2002-03-19
IBM CORP
View PDF3 Cites 1027 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

It is therefore one object of the present invention to provide an improved method and system for maintaining continued availability of datasets in external storage associated with accessing data processing systems.
It is another object of the present invention to provide an improved method and system for backup copying of records in external storage concurrent with a dramatically shortened suspension of data processing system application execution occasioned by such copying.
It is yet another object of the present invention to provide an improved method and system for incremental backup copying of records in a data processing system which minimizes, still further the suspension of data processing system application execution during such copying, as well as the actual amount of data which must be backed up.

Problems solved by technology

A modern data processing system must be prepared to recover, not only from corruptions of stored data which occur as a result of noise bursts, software bugs, media defects, and write path errors, but also from global events, such as data processing system power failure.
Thus, the opportunity cost of backing up data within a dataset may be quite high on a large multiprocessing, multiprogramming facility, relative to other types of processing.
However, this type of backup copying results in a consistency described as "fuzzy."
Requests and interrupts which occur prior to executing track-to-track customer data movement result in the restarting of the process.
This typically causes a requeueing of the request.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and system for incremental time zero backup copying of data
  • Method and system for incremental time zero backup copying of data
  • Method and system for incremental time zero backup copying of data

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

With reference now to the figures and in particular with reference to FIG. 1, there is depicted a multiprocessing, multiprogramming data processing system according to the prior art. Such systems typically include a plurality of processors 1 and 3 which access external storage units 21, 23, 25, 27, and 29 over redundant channel demand / response interfaces 5, 7 and 9.

The illustrated embodiment in FIG. 1 may be provided in which each processor within the data processing system is implemented utilizing an IBM / 360 or 370 architected processor type having, as an example, an IBM MVS operating system. An IBM / 360 architected processor is fully described in Amdahl et al., U.S. Pat. No. 3,400,371, entitled Data Processing System, issued on Sep. 3, 1968. A configuration in which multiple processors share access to external storage units is set forth in Luiz et al., U.S. Pat. No. 4,207,609, entitled Path Independent Device Reservation and Reconnection in a Multi-CPU and Shared Device Access Syst...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Backup copying of designated datasets representing a first selected point in time consistency may be performed in a data processing system on an attached storage subsystem concurrent with data processing system application execution by first suspending application execution only long enough to form a logical-to-physical address concordance, and thereafter physically backing up the datasets on the storage subsystem on a scheduled or opportunistic basis. An indication of each update to a selected portion of the designated datasets which occurs after the first selected point in time is stored and application initiated updates to uncopied designated datasets are first buffered. Thereafter, sidefiles are made of the affected datasets, or portions thereof, the updates are then written through to the storage subsystem, and the sidefiles written to an alternate storage location in backup copy order, as controlled by the address concordance. At a subsequent point in time only those portions of the designated datasets which have been updated after the first selected period and time are copied, utilizing an identical technique.

Description

BACKGROUND OF THE INVENTION1. Technical Field:This invention relates in general to methods and systems for maintaining continued availability of datasets in external storage associated with accessing data processing systems, and in particular the present invention relates to backup copying of records in external storage concurrent with a dramatically shortened suspension of data processing system application execution occasioned by such copying. Still more particularly, the present invention relates to a method and system for incremental backup copying of records in a data processing system which minimizes still further the suspension of data processing system application execution during such copying.2. Description of the Related Art:A modern data processing system must be prepared to recover, not only from corruptions of stored data which occur as a result of noise bursts, software bugs, media defects, and write path errors, but also from global events, such as data processing sys...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(United States)
IPC IPC(8): G06F11/14G06F12/00
CPCG06F11/1451G06F11/1461G06F11/1466
Inventor EASTRIDGE, LAWRENCE ELWOODKERN, ROBERT FREDERICRATLIFF, JAMES MITCHELL
Owner IBM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products