International Business Machines Corporation

Kenneth Wayne Boyd

Kenneth Fairclough Day, Iii

John Jay Wolfgang

Gregory E McBride

Philip Matthew Doatmas

William Frank Micka

Robert Frederic Kern

Kenneth F Day, Iii

Jeffrey William Palm

Gail Andrea Spear

Shachar Fienblit

Philip Matthew Dudas

Michael Edward Factor

Douglas William Dewey

Robert Francis Bartfai

Kirby Grant Dahman

Gerhard Banzhaf

Harry M Yudenfriend

Robert Bruce Nicholson

Richard Albert Welp

Thomas W Bish

Amiram Hayardeny

Helmut H Weber

David Michael Shackelford

Mark Francis Wilding

Olympia Gluck

James Chien-Chiung Chen

Stefan Amann

John Earle Lindley

David W Messina

Stephen F Edel

Christopher Diebold O'Toole

Aviad Zlotnick

Sam Clark Werner

Thomas Schlipf

Gal Ashour

Ifat Nuriel

Eli Malul

Dalit Tzafrir

John Thomas Flynn, Jr

Maor Ben-Dayan

Charles William Lickel

Donna Eng Dillenberger

Kenta Ninose

Akinobu Shimada

Tsutomu Sukigara

Noa Privman-Horesh

Gerardo De Jesus Frias Garcia

Ryusuke Ito

Yasumitsu Mizoguchi

Matthew J Kalos

John R Flanagan

Daniel Francis Casper

William James Scales

Warren Keith Stanley

Orit Nissan-Messing

Mark Edward Dean

Thomas Charles Jarvis

David B Petersen

Lisa Joan Gundy

David Allan Pease

Robert Allen Hood

Alan George McClure

Thomas William Beglin

George Oliver Penokie

Kenneth Fairclough Day Iii

Kennth Fairclough Day, Iii

Blair K Adamache

Nils Torbjorn Kaving

Phillip Matthew Doatmas

Robert Charles Friske

An incremental backup system that performs the following (not necessarily in the following order): (i) making a plurality of time-ordered journal entries; (ii) determining that a corruption condition exists; (iii) responsive to a corruption condition, constructing a first incremental mirror data set that reflects a backup data set and all journal entries up to a first corrupted journal entry which is the earliest in time journal entry, of the plurality of journal entries, that is a corrupted journal entry; (iv) responsive to a corruption condition, constructing a second incremental mirror data set that reflects the backup data set and all journal entries up to the first corrupted journal entry; and (v) checking for corruption in the first and second incremental mirror data sets to determine the latest uncorrupted version of the data set.

File corruption recovery in concurrent data protection

An enhanced mechanism for providing data protection for variable length records utilizes high performance block storage metadata. In an embodiment, an emulated record that emulates a variable length record, such as a Count-Key-Data (CKD) record or an Extended-Count-Key-Data (ECKD) record, is generated by a Host Bus Adapter (HBA) of a mainframe system. The emulated record comprises a sequence of extended fixed-length blocks, each of which includes a data block and a footer. A confluence of the footers defines a high performance block storage metadata unit associated with the emulated record and includes a checksum that covers all data blocks and all footers of the entire emulated record. In one embodiment, the checksum is checked during transit of the emulated record between a HBA and a storage subsystem (e.g., by the HBA when the emulated record is received from the storage subsystem, and/or by a switch in the data transfer path), during a hardening step when writing the emulated record to a disk, and/or during a verification step when reading the emulated record from the disk.

Data protection for variable length records by utilizing high performance block storage metadata

A file system driver stored in a computational device receives a request to provide access to a snapshot of a rewritable file system at a selected point in time, wherein a plurality of tokens corresponding to a plurality of data units are stored in the rewritable file system, and wherein an ordering relationship is maintained among the plurality of tokens. The file system driver determines a token corresponding to the selected point in time based on the ordering relationship. A virtual subdirectory name is generated corresponding to the determined token. A virtual subdirectory is created with the generated virtual subdirectory name, wherein the virtual subdirectory is a subdirectory of a root directory. The snapshot is accessed via the subdirectory.

Accessing snapshots of a time based file system

For block based end-to-end data protection for extended count key data (ECKD) in a computing environment, information units (IU's) are aligned in a block boundary format. Block protection trailer data is added to each one of the IU's.

Blocked based end-to-end data protection for extended count key data (ECKD)

An apparatus, system, and method are disclosed for determining prefetch data. A start module communicates a start of a target software process to a storage device. A learning module learns data blocks accessed for the target software process. In one embodiment, a prefetch module prefetches the learned data blocks in response to the start of the target software process. An end module communicates the end of the target software process to the storage device. In one embodiment, the prefetch module terminates prefetching data blocks and the learning module terminates learning the data blocks accessed for the target software process in response to the end module's communication of the end of the target software process.

Monitoring program execution to learn data blocks accessed by software process for facilitating efficient prefetching

Exemplary method, system, and computer program product embodiments for block based end-to-end data protection for extended count key data (ECKD) in a computing environment are provided. In one embodiment, by way of example only, information units (IU's) are aligned in a block boundary format. Block protection trailer data is added to each one of the IU's. Additional system and computer program product embodiments are disclosed and provide related advantages.

Provided are a method, system, and article of manufacture for splitting writes between a storage controller and replication engine. A splitter executing in a storage controller manages access to primary volumes. An initialization command is received to communicate with a replication engine. A replication command is received for one primary volume and the primary volume is indicated as subject to replication. A write request is received to write data to a target primary volume of the primary volumes that is indicated as subject to the replication. The data in the write request is written to the target primary volume. The data in the write request is sent to the replication engine. The replication engine executes a copy services function associated with the target primary volume to write the data to a replication engine volume.

Splitting writes between a storage controller and replication engine

Data protection method for variable length records by utilizing high performance block storage metadata

An apparatus, system, and method are disclosed for a read-before-write storage controller instruction. A sequencer receives an atomic read-before-write instruction comprising new data, a target address for the new data, and an undo log address. An I/O unit reads old data from the target address, writes the old data and the target address to the undo log address, and writes the new data to the target address as directed by the sequencer.

Apparatus, system, and method for a read-before-write storage controller instruction

An encryption method encrypts a clear text twice using a first encryption engine to produce a first cipher text and a second encryption engine to produce a second cipher text. The method compares the first cipher text with the second cipher text, or compares a checksum of the first cipher text with a checksum of the second cipher text. If the comparison succeeds, the method transmits the data. In some embodiments, the method uses a first instance of an encryption key to produce the first cipher text and a second instance of the encryption key to produce the second cipher text.

Encryption data integrity check with dual parallel encryption engines

A mechanism is provided for managing operations in a data storage system. A first storage controller monitors operation state information associated with a plurality of operation states stored in a data structure. The first storage controller detects a change in the operation state information. The change in the operation state information is in response to a managing entity updating the operation state information to a first operation state in the plurality of operation states in the data structure. Responsive to detecting the change in the operation state information, the first storage controller identifies a reference to a first operation associated with the first operation state updated by the managing entity. The first operation is one operation in a plurality of operations. The first storage controller performs the first operation associated with the first operation state.

Idempotent storage replication management

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Tucson, AZ, United States of America

Kenneth Wayne Boyd