There have actually been a surprising number of computing platforms that implement fault-tolerant processing. It's often called "lock-step" execution. https://

There have actually been a surprising number of computing platforms that implement fault-tolerant processing. It's often called "lock-step" execution. https://www.vmware.com/content/dam/digitalmarketing/vmware/en/pdf/techpaper/vmware-vsphere-fault-tolerance.pdf https://www.vmware.com/content/dam/digitalmarketing/vmware/e... (throughout) https://en.wikipedia.org/wiki/Tandem_Computers https://en.wikipedia.org/wiki/Tandem_Computers https://www.intel.sg/content/dam/doc/product-brief/high-performance-computing-itanium-9100-powering-mainframe-solutions-on-flexible-industry-standard-servers-brief.pdf https://www.intel.sg/content/dam/doc/product-brief/high-perf... (page 5)