Virtualization definitions beginning with S

SAN - permalink - collapse

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A high-speed, high-available storage system, able to serve multiple computers at a time, dedicated to backup and archival purposes. It can be reached by Fibre Channel (FC) or iSCSI protocols.
virtualization.info - Cite This Source - This Definition
A storage system connected to a dedicated network designed for storage attachment. SAN systems are usually block-based, and typically use the SCSI command set over a Fibre Channel network (though other command sets and network types exist as well). See also Network-Attached Storage.
VMware - Cite This Source - This Definition
a collection of storage resources connected to computers through a high-speed network to facilitate storage provisioning and increase overall utilization.
Versatile Systems - Cite This Source - This Definition
A storage area network (SAN) is a high-speed special-purpose network (or subnetwork) that interconnects different kinds of data storage devices with associated data servers on behalf of a larger network of users. Typically, a storage area network is part of the overall network of computing resources for an enterprise.
Dell - Cite This Source - This Definition
Browse Related Terms: encapsulated, I/O virtualization, NAS (Network-Attached Storage), RDM (Raw Device Mapping), SAN, Storage Virtualization, virtual hard disk

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saved state - permalink - collapse

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A manner of storing a virtual machine so that it can be quickly resumed, similar to a hibernated laptop. When you place a running virtual machine in a saved state, Virtual Server and Hyper-V stop the virtual machine, write the data that exists in memory to temporary files, and stop the consumption of system resources. Restoring a virtual machine from a saved state returns it to the same condition it was in when its state was saved.
Microsoft - Cite This Source - This Definition
Browse Related Terms: blade, blade server, converter, key-value pair, server blade

scalability - permalink - collapse

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the ability to continue to function well when changed in size or volume either directly or when moved to a new context
Versatile Systems - Cite This Source - This Definition
Browse Related Terms: live backup, live migration, Migration, P2V (Physical to Virtual) migration, relocation, shadow pagetables, V2P (Virtual to Physical) migration, V2V (Virtual to Virtual) migration

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self-healing - permalink - collapse

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any hardware or software system that can detect its own faults and inefficiencies and make the necessary adjustments to restore itself to normal operation.
Versatile Systems - Cite This Source - This Definition
Browse Related Terms: integration services, paravirtualized drivers, virtual appliance, VMware Tools

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server blade - permalink - collapse

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a computer system contained on a single, hot-pluggable board, for use in a blade server.
Versatile Systems - Cite This Source - This Definition
Browse Related Terms: blade, blade server, converter, key-value pair, saved state

server consolidation - permalink - collapse

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The operation of mitigating the so called server sprawl by optimizing resource usage and simplifying management of available computers. Consolidation can be logical (managing distributed computers with central management) physical (moving several computers in a central location) or rationalized (migrate several computers in virtual machines or partitions, hosted by a single physical computer).
virtualization.info - Cite This Source - This Definition
reducing existing infrastructure server sprawl by eliminating unnecessary services and hosting the remaining services on fewer physical servers, often through the use of server virtualization, to achieve fewer points of management and lower operating costs.
Versatile Systems - Cite This Source - This Definition
Server consolidation is an approach to the efficient usage of computer server resources in order to reduce the total number of servers or server locations that an organization requires.
Dell - Cite This Source - This Definition
Browse Related Terms: cluster, cluster complete resource, management console, server containment, server rationalization, server sprawl, Virtual Infrastructure Client (VI Client)

The irrational proliferation of multiple computers inside a company infrastructure.
virtualization.info - Cite This Source - This Definition
the irrational proliferation of servers in the corporate infrastructure due to the policy of one application/one server.
Versatile Systems - Cite This Source - This Definition
Server sprawl is a situation in which multiple, under-utilized servers take up more space and consume more resources than can be justified by their workload.
Dell - Cite This Source - This Definition
Browse Related Terms: cluster, cluster complete resource, management console, server consolidation, server containment, server rationalization, Virtual Infrastructure Client (VI Client)

server virtualization - permalink - collapse

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decoupling server hardware from the operating systems and applications which run on it, either by partitioning the hardware into multiple virtual machines, or aggregating it into a single, larger server image.
Versatile Systems - Cite This Source - This Definition
Server virtualization is the masking of server resources, including the number and identity of individual physical servers, processors, and operating systems, from server users. The server administrator uses a software application to divide one physical server into multiple isolated virtual environments. The virtual environments are sometimes Called virtual private servers, but they are also known as partitions, guests, instances, containers or emulations.
Dell - Cite This Source - This Definition
Browse Related Terms: bare-metal, dom0, emulation, full virtualization, guest operating system, host OS (Operating System), hosted environment, Hosted Virtualization, operating system virtualization, partitioned, virtual machine, virtualization

Service Console - permalink - collapse

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The service console boots the systems and runs support, management, and administration applications.
VMware - Cite This Source - This Definition
Browse Related Terms: console, Full Screen Mode, Guest, headless, Host System (or Host), Normal (Windowed) Mode, VMware, VMware Virtual Machine Console

shadow pagetables - permalink - collapse

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A technique for hiding the layout of machine memory from a virtual machine's operating system. Used in some VMMs to provide the illusion of contiguous physical memory, in Xen this is used during live migration.
Xen.org - Cite This Source - This Definition
Browse Related Terms: live backup, live migration, Migration, P2V (Physical to Virtual) migration, relocation, scalability, V2P (Virtual to Physical) migration, V2V (Virtual to Virtual) migration

simultaneous multithreading - permalink - collapse

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similar to time-slice multithreading (superthreading), except that the multiple threads introduced into the pipelines on a given clock cycle can be from any available process, not all from the same process. This type of CPU often presents multiple logical processors to the OS. Compare to time-slice multithreading.
Versatile Systems - Cite This Source - This Definition
Browse Related Terms: Hyper-Threading, hyperthreading, Load Balancing, logical processor, multithreading, SMP (Symmetric Multiprocessing), superthreading, time-slice multithreading

SLA (Service Level Agreement) - permalink - collapse

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An agreement between a service provider and a customer regulating offered service in several aspects, from amount of resources available to time availability, up to faults recovery timeframe.
virtualization.info - Cite This Source - This Definition
parameters dictated by a business unit to a service provider as to performance, availability, and resiliency.
Versatile Systems - Cite This Source - This Definition
Browse Related Terms: business continuity, capacity planning, DR (Disaster Recovery), five nines, HA (High Availability), policy-based automation, Provisioning, TCO (Total Cost of Ownership), Virtual Machine Management Service

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SMP (Symmetric Multiprocessing) - permalink - collapse

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employing more than one CPU to simultaneously execute more than one program (or thread) with equal probability.
Versatile Systems - Cite This Source - This Definition
Browse Related Terms: Hyper-Threading, hyperthreading, Load Balancing, logical processor, multithreading, simultaneous multithreading, superthreading, time-slice multithreading

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SMP (Symmetric Multiprocessor) - permalink - collapse

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A multiprocessor architecture in which two or more processors are connected to a single pool of shared memory. See also Uniprocessor (UP).
VMware - Cite This Source - This Definition
Browse Related Terms: HAL (Hardware Abstraction Layer), Uniprocessor (UP), Virtual SMP, VSMP (virtual symmetric multiprocessing)

Snapshot - permalink - collapse

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A snapshot preserves the virtual machine just as it was when you took that snapshot - including the state of the data on all the virtual machine's disks and whether the virtual machine was powered on, powered off, or suspended. VMware Workstation lets you take a snapshot of a virtual machine at any time and revert to that snapshot at any time.
VMware - Cite This Source - This Definition
A snapshot conserves the state of a virtual machine so that it can be moved back any time to an earlier, stable system state.
Stonesoft - Cite This Source - This Definition
A reproduction of the virtual machine just as it was when you took the snapshot, including the state of the data on all the virtual machine's disks and whether the virtual machine was powered on, powered off or suspended. You can take spanshots of a virtual machine at any time and go to any snapshot at any time. You can take a snapshot when a virtual machine is powered on, powered off, or suspended. You can configure a virtual machine to exclude specified disks from snapshots.
Dell - Cite This Source - This Definition
Browse Related Terms: Checkpoint, Independent Virtual Disk, Nonpersistent Disk, Persistent Disk, virtual machine snapshot

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SRAT (System Resource Allocation Table) - permalink - collapse

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table that keeps track of memory allocated to a virtual machine.
VMware - Cite This Source - This Definition
Browse Related Terms: compact, differencing virtual hard disk, dynamically expanding virtual hard disk, fixed-size virtual hard disk, Growable Disk, physical disk, Preallocated Disk, Thrashing, virtual disk, virtual floppy disk

Storage Virtualization - permalink - collapse

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the pooling of physical storage on a storage area network into what appears to be a single storage device that is managed and provisioned from a central console. See also storage area network.
Versatile Systems - Cite This Source - This Definition
Virtualization is the pooling of physical storage from multiple network storage devices into what appears to be a single storage device that is managed from a central console. Storage virtualization is commonly used in a storage area network (SAN). The management of storage devices can be tedious and time-consuming. Storage virtualization helps the storage administrator perform the tasks of backup, archiving, and recovery more easily, and in less time, by disguising the actual complexity of the SAN.
Dell - Cite This Source - This Definition
Browse Related Terms: encapsulated, I/O virtualization, NAS (Network-Attached Storage), RDM (Raw Device Mapping), SAN, virtual hard disk