Abstract: A virtual machine hosting environment executing on a physical machine is operable to instantiate a virtual machine that is capable of initiating I/O operations directed to a remote storage. The virtual machine hosting environment is operable to determine when an unavailability condition exists with respect to the remote storage and when such unavailability condition no longer exists. The virtual machine hosting environment is further operable to suspend the virtual machine based at least on the determination that the unavailability condition exists and to resume the virtual machine based at least on the determination that the unavailability condition no longer exists. The virtual machine hosting environment may be still further operable to save one or more pending I/O requests generated by the virtual machine in conjunction with pausing the virtual machine and to send the pending I/O request(s) to the remote storage in conjunction with resuming the virtual machine.

Abstract: A virtual machine hosting environment executing on a physical machine is operable to instantiate a virtual machine that is capable of initiating I/O operations directed to a remote storage. The virtual machine hosting environment is operable to determine when an unavailability condition exists with respect to the remote storage and when such unavailability condition no longer exists. The virtual machine hosting environment is further operable to suspend the virtual machine based at least on the determination that the unavailability condition exists and to resume the virtual machine based at least on the determination that the unavailability condition no longer exists. The virtual machine hosting environment may be still further operable to save one or more pending I/O requests generated by the virtual machine in conjunction with pausing the virtual machine and to send the pending I/O request(s) to the remote storage in conjunction with resuming the virtual machine.

Abstract: A computer configured to operate in diagnostic mode during which the operating system is suspended. During the diagnostic mode, tests can be performed on the computer system, including hardware, and the tests do not disrupt the operating system and are not disrupted by the operating system. When diagnostic mode is triggered, execution of the operating system is suspended. When the diagnostic tests are completed, the operating system may resume operation and test data may be made available within the operating system environment. Upon resuming, the state of the computer prior to entering diagnostic mode may be restored, preventing any changes made during diagnostic mode from interfering with operation of the operating system or application components.

Abstract: A method of tracing data on a network for a Web request that detects events of the Web request as the Web request is serviced. The method provides a unique identifier (ID) for the Web request. The ID is associated with all events for the Web request in a trace log. When such events occur in the servicing of the Web request, each event is recorded with the ID of the Web request in a trace log. The trace log can be accessed via the ID to debug a Web request service failure.

Abstract: A computer configured to operate in diagnostic mode during which the operating system is suspended. During the diagnostic mode, tests can be performed on the computer system, including hardware, and the tests do not disrupt the operating system and are not disrupted by the operating system. When diagnostic mode is triggered, execution of the operating system is suspended. When the diagnostic tests are completed, the operating system may resume operation and test data may be made available within the operating system environment. Upon resuming, the state of the computer prior to entering diagnostic mode may be restored, preventing any changes made during diagnostic mode from interfering with operation of the operating system or application components.

Abstract: A method of tracing data on a network for a Web request that detects events of the Web request as the Web request is serviced. The method provides a unique identifier (ID) for the Web request. The ID is associated with all events for the Web request in a trace log. When such events occur in the servicing of the Web request, each event is recorded with the ID of the Web request in a trace log. The trace log can be accessed via the ID to debug a Web request service failure.

Abstract: Methods, systems, and computer program products for correlating trace events to facilitate analysis based on how the trace events are related. Relationship information that defines relationships between logical operations is maintained within a correlation identifier stack. A correlation identifier that marks the occurrence of a logical operation is obtained for executing software and stored in the correlation identifier stack. A trace event is generated that comprises both the correlation identifier stack and an initial event payload to describe the runtime behavior of the executing software. The trace event is stored to a trace log for subsequent analysis of the executing software based on the logical operation relationship information in the correlation identifier stack and the initial correlation identifier that marks the occurrence of the logical operation. Upon obtaining an indication that the logical operation has ended, the correlation identifier is removed from the correlation identifier stack.

Abstract: A framework and method are disclosed for providing/consuming data items. A memory structure is created within an address space allocated to a provider application. The memory structure stores performance counter data generated by the provider application. The counter provider application registers a counter provider and an associated performance counter memory structure via a set of application program interface methods. Thereafter, a counter provider consumer application, via additional application program interface methods, determines the identity of the performance counter provider, sets up a buffer to receive the counter data of the counter provider, and requests extraction of the counter data stored within the performance counter memory structure. The transfer of data from the provider application to the consumer application occurs through the system API.

Abstract: A framework and method are disclosed for carrying out request completion tracing across request identification boundaries. When a request traverses an identification boundary, an event identifies the old and new request identifications and stores this linking information in a trace event record. Thereafter, a consumer of records maintains track of request completion by incorporating the linking information to switch identifications used to track completion of the request across request identification boundaries encountered by the system while responding to the received request. A request trace event record consumer architecture with enhanced tracking capabilities based upon a specified state machine provides greater power when interpreting the trace records associated with completion of requests by a server system.