International Business Machines Corporation

William Romney White

Matthew J Kalos

Harry M Yudenfriend

Clint Alan Hardy

Susan Kay Candelaria

Stephen G Wilkins

Mark P Gardiner

Damian Leo Osisek

Stephen Richard Nichols

James P McCormick, Iii

Daniel M Griffith

A computer-implemented method for transferring a reserve to a target host, according to one embodiment, includes granting to a source system, by a control unit, a reserve for a volume of a storage device. A push reserve command is received from the source system. The push reserve command specifies: a transfer of the reserve to a target system, parameter data identifying the target system, and path information specifying the source system. The reserve is transferred only to the target system in response to release of the reserve by the source system.

Methods for transferring reserves when moving virtual machines across systems

According to one embodiment, a host system includes logic adapted for receiving device information from a source system, logic adapted for building a virtual device based at least in part on the received device information, logic adapted for transferring a reserve of a storage device to the host system and/or receiving results of transferring the reserve to the host system, logic adapted for determining if the reserve is held by the host system, logic adapted for recording the reserve if the reserve is held by the host system, and logic adapted for sending a notification that the reserve is not held by the host system if the reserve is not held by the host system. Other systems and computer program products are also described according to various embodiments.

Systems and computer program products for transferring reserves when moving virtual machines across systems

According to one embodiment, a method includes receiving device information from a source system; building a virtual device on a host system based at least in part on the received device information; at least one of: transferring a reserve of a device stored on a storage device to a target system; and receiving results of transferring the reserve to the target system; determining if the reserve is held by the target system; recording the reserve if the reserve is held by the target system; and sending a notification that the reserve is not held by the target system if the reserve is not held by the target system. Other methods are also described according to various embodiments.

System, method and program product for managing a plurality of configurations of a first virtual machine. A command is received to set the configuration of the first virtual machine for processing a next incoming interaction and subsequent incoming interactions of at least one protocol from one or more other virtual machines to a configuration exhibited by the first virtual machine which first subsequently prepares to receive the next incoming interaction. The configuration exhibited by the first virtual machine which first prepared to receive the next incoming interaction is determined. The first virtual machine configuration which first prepared to receive the next incoming interaction processes the next incoming interaction.

System, method and program for managing communication with multiple configurations for virtual machine

A technique for shutting down virtual machines in a computer system which comprises a real computer and a virtual machine operating system. The virtual machine operating system comprises a common base portion and a plurality of virtual machines sharing the common base portion. According to one feature of the present invention, the common base portion receives a shutdown signal from the real computer. The shutdown signal specifies a time period for shutdown of the common base portion or the virtual machine operating system. Next, the common base portion determines a time period for shutdown of the virtual machines by subtracting a time required to shutdown the common base portion from the specified time period. Next, the common base portion sends requests to the virtual machines to shut down in an orderly manner within the time period determined for shutdown of the virtual machines. The common base portion determines when and if each of the virtual machines shuts down in an orderly manner. If all of the virtual machines shut down in an orderly maimer before the time period determined for shutdown of the virtual machines lapses, before lapse of the time specified in the shutdown signal from the real computer, the common base portion shuts itself down. However, if all of the virtual machines do not shut down in an orderly manner before the time period determined for shutdown of the virtual machines lapses, upon lapse of said time period determined for shutdown of the virtual machines, the common base portion shuts itself down. The shutting down of the common base portion disrupts any of the virtual machines that did not shut down in an orderly manner. The shutdown can also be initiated by a user at or an application running on one of the virtual machines.

Growing community of inventors

Endwell, NY, United States of America

William Romney White