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Automated management of off-site storage volumes for disaster recovery

Filing Information

Patent Number: US5673382
Application Number: US8655791
Filing date: 05/30/1996
Issue date: 09/30/1997
Predicted expiration date: 05/30/2016

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Inventor(s): David Maxwell Cannon · Michael Allen Kaczmarski ·
Assignee(s): International Business Machines Corporation · View assignee updates
Attorney/Agent(s): Robert M. Sullivan ·
Primary Examiner: Beausoliel, Jr.; Robert W. ·
Assistant Examiner: Joseph E. Palys ·

U.S. Classifications: 395/182.04 · 395/182.13 ·
International Classifications: G06F 1100 ·
International Classifications: 395182.04;182.13;182.17;182.18;618;620;622 ·
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USPTO · PAIR · esp@cenet · Patent Family
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Abstract

A data processing system providing disaster recovery and using a client-server configuration provides a method and apparatus for reclaiming off-site storage volumes without requiring the volumes to be mounted or transported to the primary site. The system includes primary volumes and resident copy volumes at the primary site and off-site storage volumes for disaster recovery at the remote site. The system first determines which off-site storage volumes are eligible for reclamation. For each eligible off-site volume, the system locates, within the primary site, a primary copy of every file remaining on the off-site volume that is still required for disaster recovery. These primary copies are then copied to a resident recovery volume at the primary storage site. The eligible off-site volume is then marked empty, and the resident recovery volume is classified as an off-site volume. The resident recovery volume is then transported to the remote storage site and the empty off-site volume is returned to the primary storage site to be reused as a resident copy volume.

References Cited

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King et al., "Overview of Disaster Recovery for Tarnsaction Processing Systems", Distributed Computing Systems, int'l Conf. IEEE, pp. 286-293 1990.

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Independent Claims | See all claims (20)

1. In a disaster recovery system having a primary storage site and a remote storage site, said remote storage site having a plurality of off-site storage volumes for storing a disaster recovery copy of client data files, said primary storage site having a plurality of client systems generating said client data files, and a server coupled to said plurality of client systems for managing copies of said client data files at said primary storage site and said remote storage site, said server comprising:a plurality of primary storage volumes for storing a primary copy of said client data files;a plurality of resident copy storage volumes for storing a back-up copy of said client data files;a server database for maintaining directory information and reference location information for said copies of said client data files; anda storage manager coupled to said primary storage volumes, said resident copy storage volumes, and said server database, said storage manager storing said primary copy of said client data file received from said client system in said primary storage volume, said storage manager also determining which of said resident copy storage volumes are to be classified as off-site storage volumes and transported to said remote storage site for disaster recovery, said storage manager also reclaiming said off-site storage volumes without mounting said off-site storage volumes at said primary storage site or said remote storage site.
13. In a disaster recovery system having a primary storage site and a remote storage site, said primary storage site having a plurality of client systems generating client data files, a server coupled to said plurality of client systems, said server having a plurality of primary storage volumes for storing a primary copy of said client data files and a plurality of resident copy storage volumes for storing a back-up copy of said client data files, said remote storage site having a plurality of off-site storage volumes for storing said back-up copies needed for disaster recovery, a method in said server for reclaiming said off-site storage volume without mounting said off-site storage volume comprising steps of:maintaining directory information and reference location information in a server database to link said primary copy and said back-up copy of said client data files;selecting a set of eligible off-site storage volumes to be reclaimed;for each said eligible off-site storage volume, identifying a set of remaining back-up copies stored on said off-site storage volume necessary to maintain disaster recovery protection;for each said remaining back-up copy, copying said primary copy corresponding to said remaining back-up copy from said primary storage volume to a recovery resident copy storage volume; andclassifying said recovery resident copy storage volume as a new off-site storage volume and said eligible off-site storage volume as empty.
20.20. In a disaster recovery system having a primary storage site and a remote storage site, said primary storage site having a plurality of client systems generating client data files, a server coupled to said plurality of client systems, said server having a plurality of primary storage volumes for storing a primary copy of said client data files and a plurality of resident copy storage volumes for storing a back-up copy of said client data files, said remote storage site having a plurality of off-site storage volumes for storing said back-up copies needed for disaster recovery, a program product having executable computer instructions for reclaiming said off-site storage volume without mounting said off-site storage volume comprising:a computer readable storage medium for storing said executable computer instructions, said executable computer instructions comprising:maintaining directory information and reference location information in a server database to link said primary copy and said back-up copy of said client data files;selecting a set of eligible off-site storage volumes to be reclaimed;for each said eligible off-site storage volume, identifying a set of remaining back-up copies stored on said off-site storage volume necessary to maintain disaster recovery protection;for each said remaining back-up copy, copying said primary copy corresponding to said remaining back-up copy from said primary storage volume to a recovery resident copy storage volume; andclassifying said recovery resident copy storage volume as a new off-site storage volume and said eligible off-site storage volume as empty.

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