International Business Machines Corporation

Gerard Maclean Dearing

William Stuart Edwards

Lyle LeRoy Merithew, Jr

Thomas Alexander Mahon

Elmer Enrique Latorre

Terri A Menendez

Jimmy Paul Strickland

Kenneth Michael Kapulka

Tan Q Nguyen

Harry M Yudenfriend

Peter Grimm Sutton

Jeffrey Mark Nick

Michael D Swanson

John Richard Paveza

Jaya Srikrishnan

Michael Koester

Wendell W Wilkinson

Cecilia Carranza Lewis

Andrew B Trinh

Kelly Scott Carpenter

Jwu-Shyan Tarng

Wilson Yang

Thomas E Litty

Romell Williams

Nelson Wayne Fincher

Janet Ellen Barton

A computer-implemented method according to one embodiment includes receiving a request to add a generic volume entry to a generic volume element list, storing the generic volume entry in the generic volume element list in a SMS configuration in a SCDS, and building a volume list definition of the SMS configuration. A unit control block chain is parsed for determining additional specific volumes. It is determined whether a specific volume found in the parsing was not used in the building. In response to a determination that the specific volume found in the parsing was not used in the building, it is determined, for the specific volume found in the parsing, whether at least one predetermined condition is met. The specific volume found in the parsing is added to the volume list definition in response to a determination that the at least one predetermined condition is met.

Using generic volume entries to add specific volumes managed by a storage management subsystem (SMS) to a volume list definition

A method for suppressing data mirroring between a primary storage system and a secondary storage system is disclosed. In one embodiment, such a method includes defining a data class with an attribute designed to suppress mirroring of data from a primary storage system to a secondary storage system. The method assigns a data set to the data class, thereby causing the data set to inherit the attribute. In certain embodiments, assigning the data set to the data class includes recording the attribute in one or more of a volume-table-of-contents (VTOC) and a catalog used to reference the data set. The method automatically suppresses mirroring of the data set from the primary storage system to the secondary storage system in accordance with the assigned attribute. A corresponding system and computer program product are also disclosed.

Fine-grain asynchronous mirroring suppression

In various embodiments, a method, system, and computer program product for injecting error code include logic and/or program instructions configured to determine, by a local processor, critical points in executing code of software under test on a remote system, build, by the local processor, a testcase to invoke the software under test on the remote system, determine, by the local processor, an appropriate response action for each critical point based on an error encountered at each critical point as reported by a remote processor of the remote system, cause, by the local processor, the remote processor to inject a critical point segment into the executing code at a corresponding critical point, and receive, by the local processor, a unique identifier of each critical point segment output by the remote processor in response to injecting the critical point segment into the executing code.

System, method, and computer program product for error code injection

In various embodiments, a method, system, and computer program product for injecting error code include logic and/or program instructions configured for determining critical points in executing code of software under test, building a testcase to invoke the software under test, determining an appropriate response action for each critical point based on an error encountered at each critical point, injecting a critical point segment into the executing code at a corresponding critical point, and outputting a unique identifier of each critical point segment, the testcase being configured to issue commands, with each command limiting which of one or more critical points remains active based on one of: a number of times the one or more critical points have been accessed in the executing code, a number of times a critical point has been skipped, and an amount of times a critical point has been accessed versus skipped.

In one embodiment, a computer program product for injecting error code includes a computer readable storage medium having computer readable program code embodied therewith. The computer readable program code includes computer readable program code configured to determine critical points in executing code of software under test, computer readable program code configured to determine an appropriate response action for each critical point based on an error encountered at each critical point, computer readable program code configured to inject a critical point segment into the executing code at a corresponding critical point, and computer readable program code configured to output a unique identifier of each critical point segment. In another embodiment, a system includes a processor, and a computer readable storage medium having computer readable program code embodied therewith having the above described functionality. Other systems and computer program products are described according to more embodiments.

In one embodiment, a computer program product includes a computer readable storage medium having computer readable program code embodied therewith, the computer readable program code being configured to: assign volume(s) to either a storage group or a reserve storage pool group, designate each of the volume(s) assigned to the storage group as a storage volume, designate each of the volume(s) assigned to the reserve storage pool group as a reserve storage volume, receive policy attributes for the storage group including a storage utilization goal and a default reserve storage pool assignment, monitor a storage utilization level for the storage group, detect when the storage utilization level for the storage group falls outside of the ideal storage utilization range, and adjust an available storage amount for the storage group to bring the storage utilization level within the ideal storage utilization range.

Dynamically managing available data storage within an automated data storage system

An apparatus, system, and method are disclosed for preserving cluster level serialization during file server serialization reinitialization. The apparatus includes a permission request module, a cluster negotiation module, and a completion notification module. The permission request module communicates a permission request to a remote file server in anticipation of a reinitialization of a local file server. The cluster negotiation module implements a reinitialization protocol on the remote file server during the reinitialization of the local file server. The completion notification module notifies the remote file server when the reinitialization of the local file server is complete. The apparatus, system, and method beneficially facilitate continued serialization negotiation among the remote file servers during the reinitialization of the serialization data on the local file server and, thereby, preserve the integrity of shared data resources.

Apparatus, system, and method for preserving cluster level serialization during file server serialization reinitialization

An apparatus, system, and method are disclosed for suspending a data access request during serialization reinitialization of a file server. The apparatus includes a request recognition module, an availability module, and a suspension module. The request recognition module recognizes a request to be processed by a file server. The availability module determines if the file server is available. The suspension module suspends the data access request if the file server is not available due to serialization reinitialization. In one embodiment, the suspension module implements a hardware interrupt delay loop to suspend an interruptible data access request, such as an application request. In another embodiment, the suspension module queues a non-interruptible data access request and notifies the operating system, for example, that the non-interruptible request has been initiated. One advantage of various embodiments of the present invention is to allow interruptible and non-interruptible data access requests to be suspended during serialization reinitialization and processed promptly after the serialization information is reinitialized.

Apparatus, system, and method for suspending a request during file server serialization reinitialization

An apparatus, system, and method are disclosed for reinitializing serialization data in a file server. The apparatus includes a failure recognition module, a discard module, and a serialization module. The failure recognition module recognizes a file system serialization failure on a file server. Upon recognition of the serialization failure, the discard module discards existing serialization data located in a first memory address space, such as a file server address space. In certain embodiments, the entire file server address space may be destroyed by the operating system. The serialization module then generates new serialization data from existing connection/position data. The connection/position data is located in a second address space, such as a client address space, that is maintained during the serialization reinitialization process. Containing and rebuilding the serialization data in this manner beneficially prevents system outages, reduces downtime, and decreases the likelihood of subsequent serialization deadlocks.

Apparatus, system, and method for file system serialization reinitialization

An apparatus, system, and method are disclosed for preserving connection/position data integrity during reinitialization of serialization information in a file server. The apparatus includes a completion rights module, a completion termination module, and a postponement module. The completion rights module grants a completion right to a sensitive process, which is characterized by an associated period of data instability. The completion termination module terminates a grant of the completion right to the sensitive process in anticipation of a reinitialization of a file server. The completion right may be terminated after the connection/position data is stable or, if necessary, in response to completion of a time out period. The postponement module postpones the reinitialization of the file server and the serialization information until after the completion rights are terminated. The apparatus, system, and method advantageously maintain the connection/position data stable during the file server reinitialization so that the connection/position data may be reliably used to rebuild the serialization information.

Apparatus, system, and method for preserving connection/position data integrity during file server serialization reinitialization

Aspects for data sharing across batch sequential processes and on-line transactional processes in a clustered arrangement of multiple data processing systems are described. In a method aspect, the method includes performing on-line transaction process accesses and batch sequential process accesses on record data. The method further includes utilizing a dual-level locking protocol for the on-line transaction process accesses and batch sequential process accesses to achieve substantially concurrent accessibility to the record data with minimized processing overhead for the batch sequential processes.

Performance optimization for data sharing across batch sequential processes and on-line transaction processes

The present invention discloses a method, apparatus, article of manufacture, and memory for providing data manipulation capabilities in a distributed processing complex comprised of multiple interconnected and coordinated computer systems. In accordance with the present invention, a data set is allocated in a data storage device coupled to the computer systems and the data set is logically subdivided into system chapters, a sysplex chapter, a table of contents, and a header. System data is stored in the system chapters. Shared data is stored in the sysplex chapter. Chapter location information that points to locations for the system chapters and the sysplex chapter is stored in the table of contents. Table of contents location information that points to a location of the table of contents is stored in the header.

Method of identifying shared and unshared information using system

A high-speed cache is shared by a plurality of independently-operating data systems in a multi-system data sharing complex. Each data system has access both to the high-speed cache and to lower-speed, upper-level storage for obtaining and storing data. Management logic in the shared high-speed cache is provided to meet the serialization and data coherency requirements of the data systems when sharing the high speed cache as a store-multiple cache in a multi-system environment.

Growing community of inventors

San Jose, CA, United States of America

Gerard Maclean Dearing