The power to meet your organization's most critical needs.

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Stratus is strongly committed to providing industry-standard protocols to offer customers flexibility in implementing their communications and networking systems. Stratus communications software products offer a full range of functionality, including networking, device emulation, and terminal connectivity, all of which conform to international and de facto standards.

Stratus communications offerings range from ASCII terminal and personal computer connectivity to fully distributed computer networks. Offerings include SNA, X.25, ISDN and TCP/IP, as well as applications and protocols for the telecommunications, financial services, retail, and transportation industries. In addition, Stratus supports the Open Systems Interconnection (OSI) model, a blueprint for international connectivity standards.

Stratus LAN support gives Stratus users direct, efficient access to standard LANs, including Ethernet and Token Ring. Stratus systems, operating as LAN servers, provide the fault tolerance required by many network-based distributed applications.

Stratus Transaction Processing Facility

The Stratus Transaction Processing Facility (TPF) provides tools for administering a fast, secure, and efficient transaction processing system. TPF includes subroutines, commands, and administrative requests for multitasking, queuing, and transaction protection. TPF provides complete file protection for transactions, including transactions that involve updates on multiple computer systems within a network. This protection ensures data integrity regardless of extended power failures, application program errors, and operator errors.

Stratus Continuous Processing

Stratus originated a unique, automatic, hardware-based fault-tolerant architecture, and continues to enhance its implementation. No other technology combines the trouble-free setup, robust processing, and transaction availability of Continuum systems.

Stratus Continuous ProcessingTM is built around the concept that all aspects of the system design must be addressed to create a system which is continuously available. Stratus provides features such as duplex self-checking hardware, operating system kernel hardening, online hardware upgrades, online service, and online system administration to avoid other potential sources of downtime. Only Stratus' fully integrated approach can keep your application, data, and processing available and free of corruption.

Stratus fault tolerance begins with power-up diagnostics that spot potential problems before they occur. Computation, storage, and I/O proceed in parallel on duplex hardware. Each circuit board checks itself for hardware errors at every machine clock cycle. If a logic fault is detected, the system stops the faulty board instantly. The duplex partner board continues to execute the program in a normal manner and at normal speed.

Thus, if a board should ever fail, there is no need for intervention by the operating system. The failed board simply drops out of service and is reported automatically to a Stratus Customer Assistance Center. This approach has the added advantage of catching not only "hard" failures, but also transient errors, resulting in higher availability and increased assurance of data integrity.

Memory is duplicated and ECC-protected; memory controller logic is self-checking. Advanced "sniffing" circuitry checks memory for errors, ensuring that seldom-used memory locations do not develop non-correctable errors. "Sniffing" does not affect the performance of ongoing work.

Disks and disk controllers are also duplicated to prevent any failure from corrupting data or interrupting system operation. Whenever a write operation is requested, the operating system writes the data to both disks. When a read operation is required, it comes from the disk whose read-write heads are closest to the data, minimizing access time and offering performance benefits in read-heavy environments. If a disk failure occurs, all disk I/O operations continue on the good drive until the malfunction is repaired. When the failure is repaired, the system automatically restores the disk. Here again, the application software is unaware of the failure or the redundant hardware architecture.

Continuous Online Service

Stratus supports Continuum with a multi-level service capacity that is unique in the industry.

The Continuum family blends the strength of the Stratus architecture, the innovations of advanced service technology, and the dedication of a responsive service organization to provide a multi-level service capacity that is unique in the industry.

All customer systems are connected to a highly secure worldwide network specifically designed for service needs: the Stratus Remote Service Network (RSN^®). Should the system's self-diagnostics detect a failure, the system automatically sends a message to a Stratus Customer Assistance Center or the customer's own center. While your processing continues uninterrupted, a replacement part is dispatched to you via overnight delivery. You or Stratus' customer-support personnel can easily install the replacement part without bringing down the application or system.

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