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What (who) is dual-attached - definition
EXTERNAL COMPUTER STORAGE, ACCESSED DIRECTLY BY A SINGLE HOST OVER A LOCAL COMPUTER BUS AND/OR INTERFACE (AS OPPOSED TO A NETWORK)
Direct attached storage; Direct Attached Storage
![Typical NAS using [[ethernet]] for main connectivity](https://commons.wikimedia.org/wiki/Special:FilePath/QNAP TS-269L rear 20130511.jpg?width=200 "Typical NAS using [[ethernet]] for main connectivity")
dual-attached
The form of FDDI interface where a device is connected to
both FDDI token-passing rings, so that uninterrupted operation
continues in the event of a failure of either of the rings.
All connections to the main FDDI rings are dual-attached.
Typically, a small number of critical infrastructure devices
such as routers and concentrators are dual-attached,
whereas host computers are normally single-attached or
dual-homed to a router or concentrator.
For example, a ring could be formed between a single router
and two concentrators (all dual-attached) then all other
components that need to be fault-tolerant (typically file
servers) can be dual-homed to both concentrators.
(1994-12-13)
Dual space
 = \varphi(x_1 + x_2) = \varphi(x)</math>'' for any ''<math>\varphi</math>'' in the dual space.](https://commons.wikimedia.org/wiki/Special:FilePath/Double dual nature.svg?width=200 "''x''<sub>1</sub> + ''x''<sub>2</sub>}}.
The addition +′ induced by the transformation can be defined as ''<math>[\Psi(x_1) +' \Psi(x_2)](\varphi) = \varphi(x_1 + x_2) = \varphi(x)</math>'' for any ''<math>\varphi</math>'' in the dual space.")
VECTOR SPACE OF LINEAR FUNCTIONALS (MAY CONSIST ONLY ON CONTINUOUS FUNCTIONALS OR OF ALL FUNCTIONALS)
Duality (linear algebra); Dual vector space; Algebraic dual; Continuous dual; Continuous dual space; Algebraic dual space; Norm dual; Double dual; Topological dual space; Dual (linear algebra); Annihilator (linear algebra); Dual Space
In mathematics, any vector space V has a corresponding dual vector space (or just dual space for short) consisting of all linear forms on V, together with the vector space structure of pointwise addition and scalar multiplication by constants.
Dual-thrust
TYPE OF SOLID PROPELLANT ROCKET ENGINE
Dual thrust; Dual-thrust; Dual-thrust rocket engine; Dual-thrust rocket
In a dual-thrust solid propellant rocket engine, the propellant mass is composed of two different types (densities) of fuel. In the case of a tandem dual-thrust motor, the fuel closest to the rocket nozzle burns fast and the fuel further into the motor's body burns slower.
Wikipedia
Direct-attached storage
Direct-attached storage (DAS) is digital storage directly attached to the computer accessing it, as opposed to storage accessed over a computer network (i.e. network-attached storage). DAS consists of one or more storage units such as hard drives, solid-state drives, optical disc drives within an external enclosure. The term "DAS" is a retronym to contrast with storage area network (SAN) and network-attached storage (NAS).
