Abstract: In a computer system, upon the occurrence of a reboot command, RunTime Abstraction Services (RTAS) microcode is loaded onto a first host processor. The service processor, upon request from the RTAS microcode, then issues a command to reset all host processors other than the first host processor on which the RTAS microcode resides, and then the RTAS microcode issues a series of commands to reset all I/O adapters. Once the host processors and I/O adapters have been reset, they are initialized to a predetermined, known state. Only after the host processors and I/O adapters have been reset and initialized is the reboot request executed. By resetting all but the first host processor and the I/O adapters before executing the reboot request, all activity originating from the host processors and from the I/O drawers is terminated, so that when the reboot request is executed, the host processors and I/O drawers are ready for initialization.

Abstract: A system, method, and computer program product are disclosed for executing a reliable warm reboot of one of multiple partitions included in a logically partitioned data processing system. The data processing system includes partition hardware. A request to reboot a particular partition is received within the partition where the particular partition includes multiple processors. Prior to executing the reboot request, the partition hardware is set to a predetermined state. The reboot request is then executed within the particular partition. The predetermined state is preferably achieved by resetting the partition hardware to a predetermined state.

Abstract: A method and system for identifying a source of a corrupt data in a memory in a multiprocessor computer system. When a computer program stores corrupt data causing a program failure or a system crash, the corrupt data and its address are identified. The multiprocessor computer system is shut down, and the corrupt data is cleared from the memory. Before fully re-booting the multiprocessor computer system, a processor is selected from the multiprocessor computer system to load and run monitor code designed to monitor the location where the corrupt data was stored. The program that previously stored the corrupt data is restarted, and the selected processor detects any re-storage of the corrupt data in the same memory address. All processors in the computer system are then immediately suspended. The registers of all processors suspected of storing corrupt data are inspected to determine the source of the corrupt data.

Abstract: A system, method, and computer program product are disclosed for preventing machine crashes due to hard errors in one of multiple, different processors that are included in a logically partitioned data processing system. An error occurring in one of the processors is detected. A determination is then made regarding whether the processor has been deconfigured. The partition is then rebooted only in response to a determination that the processor has been deconfigured and will not be included in the partition processor resources. Thus, only the configured processors are rebooted. The deconfigured processor is not rebooted.