Yokogawa Electric Corporation

Shota Uehara

Yoshitaka Yoshida

Takeshi Ohno

A fault tolerant system includes a primary virtual machine that is formed on a primary machine in which a primary hypervisor runs, and is adapted to input virtual interrupt based on an external interrupt from the primary hypervisor to a primary guest OS, and a secondary virtual machine that is formed on a secondary machine in which a secondary hypervisor runs, and is adapted to input the virtual interrupt to a secondary guest OS on the basis of timing information on the virtual interrupt transmitted from the primary virtual machine. The primary virtual machine is adapted to collect operation performance information from the secondary virtual machine, and to configure an operation performance of the primary virtual machine and an operation performance of the secondary virtual machine so that the operation performance of the primary virtual machine becomes equal to the operation performance of the secondary virtual machine.

Fault tolerant system and method for performing fault tolerant

A fault tolerant system includes a primary virtual machine formed on a primary machine in which a primary hypervisor runs, and configured to input virtual interrupt based on an external interrupt from the primary hypervisor to a primary guest OS, and a secondary virtual machine formed on a secondary machine in which a secondary hypervisor runs, and configured to input virtual interrupt to a secondary guest OS on the basis of timing information on the virtual interrupt transmitted from the primary virtual machine. The primary virtual machine is configured to determine whether the virtual interrupt is generated, or not, upon receiving the external interrupt from the primary hypervisor, and only if it is determined that the virtual interrupt is generated, the primary virtual machine is configured to input the virtual interrupt to the primary guest OS, and to transmit timing information on the virtual interrupt to the secondary virtual machine.

A fault tolerant system includes a primary virtual machine that is formed on a primary machine in which a primary hypervisor runs, and is configured to input virtual interrupt based on an external interrupt from the primary hypervisor to a primary guest OS, and a secondary virtual machine that is formed on a secondary machine in which a secondary hypervisor runs, and is configured to input the virtual interrupt to a secondary guest OS on the basis of timing information on the virtual interrupt transmitted from the primary virtual machine. The primary virtual machine is configured to transmit the timing information on the virtual interrupt including the number of branch instructions executed by the primary guest OS before inputting the virtual interrupt, and including an execution suspension position when inputting the virtual interrupt to the secondary virtual machine.

A primary virtual machine is formed on a primary machine in which a primary hypervisor runs, and inputs virtual interrupt based on an external interrupt from the primary hypervisor to a primary guest OS. A secondary virtual machine is formed on a secondary machine in which a secondary hypervisor runs, and inputs the virtual interrupt to a secondary guest OS on the basis of timing information on the virtual interrupt transmitted from the primary virtual machine. When inputting the virtual interrupt to the primary guest OS, the primary virtual machine suspends the primary guest OS, and determines whether the suspended position is in a critical section. If the suspended position is not in the critical section, the primary virtual machine inputs the virtual interrupt at the suspended position. If the suspended position is in the critical section, the primary virtual machine changes the suspended position, and again performs the determination.

Growing community of inventors

Musashino, Japan

Shota Uehara