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{{refimprove|date=November 2012}}{{In use}}
A '''shared disk architecture''' (SD) is a [[distributed computing]] architecture in which all disks are accessible from all cluster nodes.<ref name=stopford>{{cite web | url=http://www.benstopford.com/2009/11/24/understanding-the-shared-nothing-architecture/ | title=Shared Nothing v.s. Shared Disk Architectures: An Independent View | date=November 24, 2009 | accessdate=November 1, 2012}}</ref> It contrasts with [[shared nothing architecture]], in which all nodes have sole access to distinct disks.<ref name=stopford/> Multiple processors can access all disks directly via intercommunication network and every processor has local memory.
Shared Disk has two advantages over Shared memory. Firstly, each processor has its own memory, the memory bus is not a bottleneck; secondly, the system offers a simple way to provide a degree of fault tolerance.
[[File:Shared Disk Architecture.jpg|thumb|Shared Disk Architecture]]
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