H
Harry M. Yudenfriend
Researcher at IBM
Publications - 196
Citations - 3481
Harry M. Yudenfriend is an academic researcher from IBM. The author has contributed to research in topics: Input/output & Host (network). The author has an hindex of 35, co-authored 196 publications receiving 3480 citations.
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Patent
Peer-to-peer backup system with failure-triggered device switching honoring reservation of primary device
TL;DR: In this article, a peer-to-peer backup storage system automatically switches from a primary storage site to a mirrored backup site in response to a primary site failure, where the secondary site then honors any existing host initiated reservation of primary storage.
Patent
Concurrent switch to shadowed device for storage controller and device errors
TL;DR: In this article, a remote data shadowing between a primary and a secondary site uses a method and apparatus for swapping, or switching, host directed I/O operations from a primary data storage device to a secondary data storage devices in a remote copy duplex pair.
Patent
Database backup system ensuring consistency between primary and mirrored backup database copies despite backup interruption
Robert Frederic Kern,William Frank Micka,Jeffrey M. Nick,Larry R. Perry,David B. Petersen,Harold Glen Slone,Gail Andrea Spear,Harry M. Yudenfriend +7 more
TL;DR: In this paper, a database management system ensures consistency between primary and mirrored backup copies of a database, despite occurrence of a suspending condition interrupting the normal process of mirroring the primary database.
Patent
Dynamically changing a system i/o configuration definition
Richard Cwiakala,Eugene P. Hefferon,Kenneth J. Oakes,Allen H. Preston,David Emmett Stucki,Leslie W. Wyman,Harry M. Yudenfriend +6 more
TL;DR: In this article, a mechanism for changing the system I/O configuration definition in the channel subsystem of a data processing system without having to do a power on reset operation is presented.
Patent
Method and means for limiting duration of input/output (I/O) requests
TL;DR: A scan routine compares the total time for the I/O request (including waiting time and retry time) against the appropriate time limit(s), and terminates the request if the time limit is exceeded as discussed by the authors.