Recovery of guest virtual machines after failure of a host real machine
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United States of America Patent
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Jun 16, 1987
Grant Date -
N/A
app pub date -
Dec 28, 1984
filing date -
Dec 28, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention disclosed and claimed herein provides a method for a virtual machine, which maps to the V=R region of a host machine's address space, to resume program execution successfully when the host operating system terminates and subsequently restarts successfully after the occurrence of a system incident. The system incident brings the computer system down, but with a reasonable chance that the system will be able to bounce. A bounce occurs when the host operating system nucleus is reinitialized or refreshed. The virtual machine will be allowed to survive the system incident as long as its integrity can be maintained, i.e. as long as its status and in-progress work can be preserved. The status and in-progress work of the virtual machine is preserved in a reserved region of host storage in such a way that the time to save and restore virtual machine status is reduced, I/O that might cause further system incidents are avoided and the complexity of restoration of the virtual machine during a system incident is reduced.
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