Tandem Computers - définition. Qu'est-ce que Tandem Computers
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Qu'est-ce (qui) est Tandem Computers - définition

MANUFACTURER OF FAULT TOLERANT COMPUTER SYSTEMS
TANDEM; Tandem Computers Inc.; Tandem Computer Incorperated; Tandem Computer Inc.; Tandem Computers Incorporated; Tandem computers incorporated; Tandem computer; Tandem Computer Europe Inc; Tandem Computer Europe Inc.
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Tandem Computers         
<company> A US computer manufacturer. Quarterly sales $544M, profits $49M (Aug 1994). (1994-09-26)
Tandem         
  • Tandem seat [[Gloster Meteor]] and side-by-side seat [[Hawker Hunter]] (trainer)
  • Messerschmitt KR200 Kabrio; the folding top replaces the bubble in this version.
  • Instructor and student pilots in a [[McDonnell Douglas T-45 Goshawk]] aircraft
ARRANGEMENT IN WHICH PEOPLE, MACHINES, OR ANIMALS ARE IN LINE BEHIND ONE ANOTHER FACING FORWARD
Tandem carriage; Side-by-side seating; Tandem-seat; Side-by-side configuration; Tandem-seat configuration; Tandem seating; Tandem seat; Tandem cockpit
·noun A team of horses harnessed one before the other.
II. Tandem ·add. ·noun A tandem bicycle or other vehicle.
III. Tandem ·adv & ·adj One after another;
- said especially of horses harnessed and driven one before another, instead of abreast.
tandem         
  • Tandem seat [[Gloster Meteor]] and side-by-side seat [[Hawker Hunter]] (trainer)
  • Messerschmitt KR200 Kabrio; the folding top replaces the bubble in this version.
  • Instructor and student pilots in a [[McDonnell Douglas T-45 Goshawk]] aircraft
ARRANGEMENT IN WHICH PEOPLE, MACHINES, OR ANIMALS ARE IN LINE BEHIND ONE ANOTHER FACING FORWARD
Tandem carriage; Side-by-side seating; Tandem-seat; Side-by-side configuration; Tandem-seat configuration; Tandem seating; Tandem seat; Tandem cockpit
(tandems)
1.
A tandem is a bicycle designed for two riders, on which one rider sits behind the other.
N-COUNT
2.
If one thing happens or is done in tandem with another thing, the two things happen at the same time.
Malcolm's contract will run in tandem with his existing one.
PHRASE: usu PHR after v, oft PHR with n
3.
If one person does something in tandem with another person, the two people do it by working together.
He is working in tandem with officials of the Serious Fraud Office.
PHRASE: usu PHR after v, oft PHR with n

Wikipédia

Tandem Computers

Tandem Computers, Inc. was the dominant manufacturer of fault-tolerant computer systems for ATM networks, banks, stock exchanges, telephone switching centers, 911 systems, and other similar commercial transaction processing applications requiring maximum uptime and zero data loss. The company was founded by Jimmy Treybig in 1974 in Cupertino, California. It remained independent until 1997, when it became a server division within Compaq. It is now a server division within Hewlett Packard Enterprise, following Hewlett-Packard's acquisition of Compaq and the split of Hewlett Packard into HP Inc. and Hewlett Packard Enterprise.

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 in that manner 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.