Virtual storage
From Free net encyclopedia
Virtual storage is the storage space that may be regarded as addressable main storage by the user of a computer system in which virtual addresses are mapped into real addresses.
The size of virtual storage is limited by the addressing scheme of the computer system and by the amount of auxiliary storage available, and not by the actual number of main storage locations.
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Types
There are two main ways of implementing virtual storage.
- In-band where the management happens in a box which sits between the application boxes and the storage devices. This has the drawback of a single point of failure, added latency and reduced scalability.
- Out-of-band isn't in the connection chain but there is a server which sends information which storage is where. To make this work there needs to be a piece of software on all connecting application boxes. This adds complexity and extra management of the client software.
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