Patent
Remote data duplexing.
William Frank Micka,Claus William Mikkelsen,Robert Wesley Shomler +2 more
- 22 Feb 1994
263
TL;DR: In this paper, a system for asynchronously duplexing direct access storage device (DASD) data in a plurality of DASD subsystems has been proposed.
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Abstract: A system for asynchronously duplexing direct access storage device (DASD) data in a plurality of DASD subsystems has the advantage of decoupling the data duplexing operation from the DASD write I/O operation This ensures the write does not incur unnecessary wait states in the subsystem By establishing a sequence checkpoint at which time a set of information packets are grouped together and processed as a single sequence unit, this decoupling and independent operation takes place Through this independence, data copying to a secondary location can take place without affecting the performance of the subsystems and also not affecting the corresponding integrity of the data that is being updated
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Citations
Patent
Remote data mirroring
Moshe Yanai,Natan Vishlitzky,Bruno Alterescu,Daniel Castel,Gadi Shklarsky,Yuval Ofek +5 more
- 20 Apr 1994
TL;DR: In this paper, a data storage system which automatically provides and maintains identical secondary data on a preferably geographically remote secondary data storage device is described, which includes a primary host computer located in the first geographic location which is coupled to a primary storage system also located in a geographically remote location.
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Patent
Bundling of write data from channel commands in a command chain for transmission over a data link between data storage systems for remote data mirroring
Yuval Ofek
- 17 Mar 1997
TL;DR: In this paper, the authors propose to use the write data for all write commands in the chain into a single write command for transmission over the data link to the secondary data storage system containing the secondary (R2) volume.
481
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Software directed microcode state save for distributed storage controller
Robert Nelson Crockett,Kern Manard Ronald,Mika Frank William +2 more
- 18 Sep 1995
TL;DR: In this paper, a storage system improves error debugging by directing distributed system components associated with an error condition to temporarily suspend data processing for collecting failure information, correlated for later analysis according to an issued diagnostic state save channel command word (CCW) that is triggered by the detection of said error condition.
405
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Replication of snapshot using a file system copy differential
Philippe Armangau,Milena Bergant +1 more
- 25 Jun 2003
TL;DR: The snapshot copy facility as mentioned in this paper stores snapshot copies of a production file system and returns the difference between a specified older snapshot and a specified younger snapshot copy, and responds by returning the difference difference between the older snapshot copy and the younger version of the file system.
289
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Loosely coupled mass storage computer cluster
Bruce E. Mann,Philip J. Trasatti,Michael D. Carlozzi,John A. Ywoskus,Edward J. McGrath +4 more
- 05 Apr 2001
TL;DR: In this article, a method and apparatus redundantly store data, in particular video data objects, in a distributed computer system having at least three processor systems, each processor system being connected in point to point two way channel interconnection with each other processor system.
252
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Method and system for automated backup copy ordering in a time zero backup copy session
Lawrence Elwood Eastridge,Robert Kern,Ronald Maynard Kern,Claus William Mikkelsen,James Mitchell Ratliff +4 more
- 20 Apr 1992
TL;DR: In this paper, a method for generating a backup copy of designated datasets during concurrent execution of an application is proposed, which is accomplished on a scheduled or opportunistic basis by copying the designated datasets from the storage subsystems and then updating the address concordance in response to the copying.
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Lawrence Elwood Eastridge,Robert Frederic Kern,William Frank Micka,Claus William Mikkelsen,James Mitchell Ratliff +4 more
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TL;DR: In this article, a method for automatically terminating or resuming backup copy sessions after an abnormal interrupt or reset notification occurrence during a backup copy process is presented, where a status indication is entered into activity tables associated with a plurality of storage subsystems and devices within a data processing system.
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Data storage system for providing redundant copies of data on different disk drives
David Grant Beal,Fred Eifert,Henry Southworth Ludlam,Charles A. Milligan,George Arthur Rudeseal,Paul Robert Swiatek +5 more
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TL;DR: A disk storage system that writes multiple copies of records directed to user-specified volumes is defined in this article, where a plurality of spaced apart control units interconnected by direct data links and a corresponding plurality of sets of recording means communicate over the direct data link when a write request is received by one control unit to cause one volume in each set of recording to write a copy of the received record.
288
Patent
Automated concurrent data backup system
Clyde R. Sparks
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TL;DR: In this article, the primary controller is coupled by separate logical buses to at least a set of paired mirrored or shadowed primary data storage devices, and a backup device controller is attached.
282
Recovery management in QuickSilver
TL;DR: QuickSilver uses atomic transactions as a unified failure recovery mechanism for a client-server structured distributed system that exposes the basic commit protocol and log recovery primitives, allowing clients and servers to tailor their recovery techniques to their specific needs.