International Business Machines Corporation

Lawrence Carter Blount

Itzhack Goldberg

Neil Sondhi

Sandeep R Patil

Michael T Benhase

Roger Gregory Hathorn

Riyazahamad Moulasab Shiraguppi

Brent Cameron Beardsley

Juan A Coronado

Renu Tewari

Deepak R Ghuge

Eitan D Farchi

Bret Wayne Holley

James Chien-Chiung Chen

Vernon John Legvold

Shah Mohammad R Islam

Lokesh M Gupta

Subhojit Roy

Aviad Zlotnick

Gail Andrea Spear

William Frank Micka

Carl Evan Jones

Warren Keith Stanley

Susan Kay Candelaria

Shachar Fienblit

Kenneth Wayne Todd

Thomas Charles Jarvis

Michael Howard Hartung

Rahul M Fiske

Shah Mohammad Rezaul Islam

David Frank Mannenbach

Orna Raz

Steven Robert Lowe

Stephen C West

Hana Chockler

Orna Raz-Pelleg

Sergey Novikov

Joel H Cord

Vern J Legvold

Joseph Smith Hyde

Carol Santich Michod

Timothy Alan Griffin

Yochai Ben-Chaim

Carol Santich Melgren

Emeline Yvonne Germain

Methods, systems, and computer program products are provided for performing a secure delete operation in a wide area network (WAN) including a cache site and a home site. A method includes identifying a file for deletion at the cache site, determining whether the file has a copy stored at the home site, detecting a location of the copy at the home site prior to a disconnection event of the cache site from the home site, deleting the file from the cache site during the disconnection event, and in response to the secure deletion of the file not being complete during the disconnection event, indicating on a table a remote inode number assigned to the copy associated with the file at the home site, a name under which the copy is saved, and a list of data chunk tuples specifying selected data of the copy to undergo secure deletion.

Secure deletion operations in a wide area network

For an antivirus scan during a data scrub operation, the antivirus scan is concurrently performed as an overlap with the data scrub operation, wherein the data scrub operation periodically inspects and corrects memory errors. The antivirus scan concurrently performing as an overlap with the data scrub operation is increased if a reduction in disk access by a host application is detected.

Antivirus scan during a data scrub operation

For an antivirus scan during a data scrub operation, an antivirus scan is concurrently performed as an overlap with the data scrub operation, wherein the data scrub operation periodically inspects and corrects memory errors. The antivirus scan concurrently performing as an overlap with the data scrub operation is increased if a reduction in disk access by a host application is detected. A number of antivirus scan input/output (I/O) operations and data scrub I/O operations is reduced.

A method includes receiving a signal indicating a loss of power, starting a timer, the timer configured to expire after a specific time period, copying, by a distributed storage system having volatile memory configured as a write cache, write cache data from the volatile memory to a solid state device, upon receiving the signal indicating the loss of power to the storage system, configuring, the solid state device as both a read cache and the write cache, performing a health test on the storage system upon receiving the signal indicating the loss of power, and determining the loss of power as a false alarm if the timer expires and the storage system passes a health test on the storage system.

False power failure alert impact mitigation

Control of the discard of data from cache during backup of the data. In a computer-implemented system comprising primary data storage; cache; backup data storage; and at least one processor, the processor is configured to identify data stored in the primary data storage for backup to the backup data storage, where the identified data is placed in the cache in the form of portions of the data, and where the portions of data are to be backed up from the cache to the backup storage. Upon backup of each portion of the identified data from the cache to the backup storage, the processor marks the backed up portion of the identified data for discard from the cache. Thus, the backed up data is discarded from the cache right away, lessening cache pollution.

Data storage backup with lessened cache pollution

Methods, systems, and computer program products are provided for performing a secure delete operation in a wide area network (WAN) including a cache site and a home site. A method includes identifying a file for deletion at the cache site, determining whether the file has a copy stored at the home site, detecting a location of the copy at the home site prior to a disconnection event of the cache site from the home site, deleting the file from the cache site during the disconnection event, and performing a secure deletion of the copy at the home site immediately after a reconnection event of the cache site to the home site.

Various embodiments of the present invention that include receive a signal indicating a loss of power, start a timer, the timer configured to expire after a specific time period, copy write cache data from the volatile memory to a solid state device (SSD), upon receiving the signal indicating the loss of power to the storage system, configure the SSD as both a read cache and the write cache, perform a health test on the storage system, determine the loss of power as a false alarm if the timer expires and the storage system passes a health test on the storage system upon receiving the signal indicating the loss of power, and upon the timer expiring and the storage system passing the health test, copy the write cache data from the SSD back to the volatile memory.

A method includes receiving a signal indicating a loss of power, starting a timer, the timer configured to expire after a specific time period, copying, by a distributed storage system having volatile memory configured as a write cache, write cache data from the volatile memory to a solid state device, upon receiving the signal indicating the loss of power to the storage system, configuring, the solid state device as both a read cache and the write cache, performing a health test on the storage system upon receiving the signal indicating the loss of power, determining the loss of power as a false alarm if the timer expires and the storage system passes a health test on the storage system, and upon the timer expiring and the storage system passing the health test, copying the write cache data from the solid state device back to the volatile memory.

Methods, apparatus and computer program products implement embodiments of the present invention that include copying, by a storage system having a volatile memory configured as a write cache, write cache data from the volatile memory to a solid state device, upon receiving a signal indicating a loss of power to the storage system. Subsequent to copying the write cache data, the solid state device is configured as the write cache.

Apparatus and computer program products implement embodiments of the present invention that include copying, by a storage system having a volatile memory configured as a write cache, write cache data from the volatile memory to a solid state device, upon receiving a signal indicating a loss of power to the storage system. Subsequent to copying the write cache data, the solid state device is configured as the write cache.

For an antivirus scan during a data scrub operation, an antivirus scan is concurrently performed as an overlap with the data scrub operation, wherein the data scrub operation periodically inspects and corrects memory errors.

A method for software processing includes obtaining change information, which records changes that have been performed in respective locations in software code. The change information is processed so as to assign to at least some of the locations respective priorities, which are indicative of respective likelihoods that the locations contain program faults. The at least some of the locations are presented to a user in accordance with the assigned priorities.

Evaluation of software based on change history

A coverage analysis tool may determine coverage in respect to heterogeneous coverage tasks associated with different hierarchy levels of a tasks hierarchy. The coverage analysis tool may iteratively refine coverage tasks to determine coverage of sub-tasks. In some cases, coverage tasks may be unrefined in order to reduce overhead of coverage analysis in performance of the software under test, such that the software under test may perform in an essentially similar manner as in non-testing mode.

Heterogenic Coverage Analysis

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Tucson, AZ, United States of America

Lawrence Carter Blount