VMware Glossary

July 17, 2016

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VMware Glossary By Haim Cohen

If you a  VMware Administrator, here you can find VMware terms you should know

Last update: July 17, 2016

Transparent Page Sharing
Transparent page sharing is a method by which redundant copies of pages are eliminated. This helps to free memory that a virtual machine would otherwise be using.
Because of the way TPS works with hardware-assisted memory virtualization systems like Intel EPT Hardware Assist and AMD RVI Hardware Assist, esxtop may show zero or few shared pages in these systems.
Page sharing will show up in esxtop only when host memory is overcommitted. The rest of this article provides background and details.

Direct Console User Interface
You must access the DCUI to troubleshoot issues and if there are no remote management tools available, such as DRAC, iLo, or RSA, to access the ESXi host.

Virtual non-uniform memory access
vNUMA (virtual non-uniform memory access) is a memory-access optimization method for VMware virtual machines (VMs) that helps prevent memory-bandwidth bottlenecks.

High Availability
High Availability refers to a system or component that is continuously operational for a desirably long length of time. Availability can be measured relative to “100% operational” or “never failing.”
A widely-held but difficult-to-achieve standard of availability for a system or product is known as “five 9s” (99.999 percent) availability.

Fault Tolerance
VMware vSphere® Fault Tolerance (FT) provides continuous availability for applications (with up to 4 virtual CPUs) in the event of server failures by creating a live shadow instance of a virtual machine that is always up-to-date with the primary virtual machine.
In the event of a hardware outage, vSphere FT automatically triggers failover—ensuring zero downtime and preventing data loss.
After failover, vSphere FT automatically creates a new, secondary virtual machine to deliver continuous protection for the application.

Distributed Resource Scheduler
Group VMware ESXi hosts into resource clusters to segregate the computing needs of different business units. VMware vSphere clusters allow you to:
– Provide highly available resources to your workloads.
– Balance workloads for optimal performance.
– Scale and manage computing resources without service disruption.

Virtual Machine File System
Virtual Machine File System (VFMS) lets you provide adequate storage for virtual machines and plan for future storage needs with minimal administrator effort or intervention.
Add or delete a vSphere host from a VMFS volume without disrupting other hosts.
Create new virtual machines without relying on a storage administrator.
Grow VMFS volumes on the fly.
Simplify storage management with automatic discovery and mapping of LUNs to a VMFS volume.

Virtual Machine
Virtual Machine (VM) is an emulation of a particular computer system.
Virtual machines operate based on the computer architecture and functions of a real or hypothetical computer, and their implementations may involve specialized hardware, software, or a combination of both.

vCenter Virtual Appliance
– The password is configured at deployment time
– The VCVA uses an embedded PostgreSQL database

Virtual Volumes
Virtual Volumes is an integration and management framework for external storage that provides finer control at the VM-level, streamlines storage operation and offers flexibility of choice.

VMware vSphere® API for Storage Awareness
VMware vSphere® API for Storage Awareness (VASA) is the primary control plane API for vSphere.
This API allows vSphere to both investigate storage configurations and to set storage properties for arrays that support this functionality.

Software-Defined Storage
Software-Defined Storage (SDS) strategy is to evolve storage architectures through the pervasive hypervisor, bringing to storage the simplicity, efficiency, and cost-savings that server virtualization brought to compute.

Storage Area Network
A storage area network (SAN) is a network which provides access to consolidated, block level data storage.
SANs are primarily used to enhance storage devices, such as disk arrays, tape libraries, and optical jukeboxes, accessible to servers so that the devices appear to the operating system as locally attached devices.

Network Attached Storage
Network-attached storage (NAS) is a type of dedicated file storage device that provides local-area network local area network (LAN) nodes with file-based shared storage through a standard Ethernet connection.

virtual storage area network
Virtual SAN is a software-defined storage offering from VMware that enables enterprises to pool their storage capabilities and to instantly and automatically provision virtual machine storage via simple policies that are driven by the virtual machine.

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