Tandem Computers, Inc. was the dominant manufacturer of fault-tolerant computer systems for ATM networks, banks, stock exchanges, telephone switching centers, and other similar commercial transaction processing applications requiring maximum uptime and zero data loss. The company was founded in 1974 and remained independent until 1997. It is now a server division within Hewlett Packard.
Tandem's NonStop systems use a number of independent identical processors and redundant storage devices and controllers to provide automatic high-speed "failover" in the case of a hardware or software failure.
To contain the scope of failures and of corrupted data, these multi-computer systems have no shared central components, not even main memory. Conventional multi-computer systems all use shared memories and work directly on shared data objects. Instead, NonStop processors cooperate by exchanging messages across a reliable fabric, and software takes periodic snapshots for possible rollback of program memory state.
Besides handling failures well, this "shared-nothing" messaging system design also scales extremely well to the largest commercial workloads. Each doubling of the total number of processors would double system throughput, up to the maximum configuration of 4000 processors. In contrast, the performance of conventional multiprocessor systems is limited by the speed of some shared memory, bus, or switch. Adding more than 4–8 processors that way gives no further system speedup. NonStop systems have more often been bought to meet scaling requirements than for extreme fault tolerance. They compete well against IBM's largest mainframes, despite being built from simpler minicomputer technology.
Besides fault tolerance and scaling, NonStop machines also featured an industry-leading implementation of an SQL relational database, and industry-leading support for networking and for geographically dispersed systems.
Other articles related to "tandem computers, tandem":
... ITUG (International Tandem User Group) now part of Connect (users group). ...
... Ungermann was tied to Tandem by an earlier White Knight deal and Ungermann resigned after his required term ... Roel renamed the company UB Networks while it was a subsidiary of Tandem Computers ... UB Networks itself was sold to Newbridge Networks successfully in 1996 after Pieper joined Tandem Computers as CEO ...
Famous quotes containing the word tandem:
“The Cad is the entire epitome, the complete blossom and fruit in one, of what we are told is an age of culture. Behold him in the vélodrome as he yells insanely after his kind as they tear along on their tandem machines in a match, and then ask yourself candidly, O my reader, if any age before this in all the centuries of earth ever produced any creature so utterly low and loathsome, so physically, mentally, individually, and collectively hideous?”
—Ouida [Marie Louise De La Ramée] (18391908)