Shared-disk architecture

A shared-disk architecture (SD) is a distributed computing architecture in which the nodes share same disk devices but each node has its own private memory.

[1] The disks have active nodes which all share memory in case of any failures.

[2] In this architecture, the disks are accessible from all the cluster nodes.

It contrasts with shared-nothing architecture, in which all nodes have sole access to distinct disks,[4] and with shared-memory, in which they also share 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.