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1. 08:50 PM - Re: Vision Microsystems VMS 1000C (Angus)
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| Subject: | Re: Vision Microsystems VMS 1000C |
A software fault tolerant computer system includes a primary virtual machine and
a secondary virtual machine. The secondary virtual machine is operable to replicate
the primary virtual machine by replicating operations performed on the
primary virtual machine. The primary and the secondary virtual machines are further
operable to test for equivalent operation of the primary and secondary
virtual machines at predetermined stages of operation. This provides software
fault tolerance wherein both a unit of replication and a component that implements
the fault tolerance mechanisms is a virtual machine (VM). Since a VM as used
by the invention has full knowledge of the semantics of application-level
code, fault tolerance mechanisms can be provided by the VMs without requiring
any increase in application complexity. Co-ordination of replicated states and
computations is achieved with characteristics of both active and passive replication.
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