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.