S

Scalability

Ability to incrementally add one or more systems to an existing cluster when the overall load of the cluster exceeds its capabilities.

Server application

Application software running on a cluster node, regardless of whether it does service registration.

Service

Data or operation made available to network clients through a virtual server, a resource group that contains a Network Name resource as well as an IP Address resource. Not necessarily a Microsoft® Windows NT® Service.

Shared device model

See Shared disk model.

Shared disk model

Clustering architecture where all systems share devices.

Shared memory model

Clustering architecture where all systems share a single main memory through which all traffic between devices must flow.

Shared nothing model

Clustering architecture where systems share neither memory nor devices. Each processor has its own memory and a copy of the operating system. Connections between processors are optimized because messages are passed across a high-speed, dedicated bus. Cluster Server uses shared nothing clusters.

Shared resource

Cluster organization in which some resources are accessible to all systems in the cluster.

Small Computer System Interface (SCSI)

A protocol for connecting devices from several classes of peripherals to a host system without requiring modifications to hardware and software.

SMB share resource

See File Share resource.

Symmetric Multiprocessing (SMP)

A computer architecture in which multiple processors share global memory and a single copy of the operating system. Application processes run as if they were on a single processor system.

System

See Node.