초록 ▼

The method and means of fault-tolerant processing includes a plurality of system building blocks, each including a real-time processor and specialized processors and local non-volatile memory that are coupled to communicate internally within each of the system building blocks, which, in turn, commun

The method and means of fault-tolerant processing includes a plurality of system building blocks, each including a real-time processor and specialized processors and local non-volatile memory that are coupled to communicate internally within each of the system building blocks, which, in turn, communicate with one another over local-area network links, and communicate with the remainder of the system over an I/O bus controlled by an I/O processor. Transaction-based processing is under control of a transaction coordinator which permits all of the transaction operations to complete successfully and then alter stored data for the completed transaction, or not to alter any stored data if a transaction is not completed. The transaction coordinator maintains a record of the distributed file accesses required during processing of a transaction, and prevents other transactions from altering stored data during processing of a transaction.

대표청구항 ▼

A distributed processing system comprising: a plurality of processing units, a plurality of interprocessor communications links each extending from each processing unit to each other processing unit, each processing unit including a plurality of interprocessor communications links, a real time proce

A distributed processing system comprising: a plurality of processing units, a plurality of interprocessor communications links each extending from each processing unit to each other processing unit, each processing unit including a plurality of interprocessor communications links, a real time processor, an applications program processor, a local memory and at least one I/O processor each connected by a bus internal to the unit and separate from an I/O channel, wherein the real time processor controls access to the internal bus by the remaining portions of the processing unit, a plurality of I/O channels, one connected to each I/O processor included within each processing unit, and a plurality of communications processors having at least two ports, each port being connected to an I/O channel associated with a different processing unit, and adapted to connect to a plurality of I/O devices, a plurality of disk controllers connected to each I/O channel, a plurality of disks each having at least two ports and configured to have a first port connected to a disk controller associated with an I/O channel connected to a first processing unit and a second port connected to a disk controller associated with an I/O channel connected to a second processing unit, and further configured to be addressable by only one of said disk controllers at a time, each processor being associated with at least a key one of said disks which said processor is capable of addressing and each such key disk being configured to store a log-containing transaction information associated with the associated processing unit, and at least one of said processing units being capable of recognizing the failure of another processing unit, examining the transaction information contained in the log stored on the associated disk, and establishing control of that associated disk.