VMware Terminology


1 ALUA: Asymmetrical logical unit access, a storage array feature.
2 Auto Deploy: Technique to automatically install ESXi to a host.
3 Balloon driver: A memory management technique; reclaims guest VM memory via VMware Tools.
4 Cluster: A collection of hosts in a vSphere data center.
5 Configuration Maximums: Guidelines of how big a VM can be; see the newest for vSphere 5.5.
6 CPU Ready: The percentage of time that the VM is ready to get a CPU cycle (higher number is bad).
7 DAS: Direct attached storage, disk devices in a host directly.
8 Datacenter: Parent object of the vSphere Cluster.
9 Datastore: A disk resource where VMs can run.
10 DNS: Domain Name Service, a name resolution protocol. Not related to VMware, but it is imperative you set DNS up correctly to virtualize with vSphere.
11 DPM: Distributed Power Management, a way to shut down ESXi hosts when they are not being used and turn them back on when needed.
12 DRS: Distributed Resource Scheduler, Automatically move a high processing virtual machine to
another ESXi host that has more resources
13 Dynamic grow: A feature to increase the size of VMDK while the VM is running.
14 ESXi: The vSphere Hypervisor from VMware
15 FCoE: Fibre Channel over Ethernet, a networking and storage technology.
16 FT: Fault Tolerance, When a ESX host fails, virtual machines are replayed on another
ESX host.
• Required that HA be enabled
• Impact: Virtual machines enabled for FT are resumed without any
interruption of service
17 HA: High Availability, When a ESX host fails, virtual machines are restarted on another
ESX host.
• Impact: Virtual machines are restarted resulting in 5-10+ minutes to be operational again
• One ESXi host is the Master (Running), another ESXi host is the Slave (Connected)
18 HBA: Host Bus Adapter for Fibre Channel storage networks.
19 Host Profiles: Feature to deploy a pre-determined configuration to an ESXi host.
20 Hot-add: A feature to add a device to a VM while it is running, such as a VMDK.
21 Hypervisor swap: A memory management technique; puts guest VM memory to disk on the host.
22 IOPs: Input/Outputs per second, detailed measurement of a drive’s performance.
23 iSCSI: Ethernet-based shared storage protocol.
24 ISO: Image file, taken from ISO 9660file system for optical drives.
25 LUN: Logical unit number, identifies shared storage (Fibre Channel/iSCSI).
26 Maintenance mode: An administration technique where a host evacuates it’s running and powered off VMs safely before changes are made.
27 Memory compression: A memory management technique; applies a compressor to active memory blocks on the host.
28 MOB: Managed Object Reference, a technique vCenter uses to classify every item.
29 NAS: Network attached storage, a shared storage technique for file protocols (NFS).
30 Nested hypervisor: The ability to run ESXi as a VM either on ESXi, VMware Workstation, or VMware Fusion.
31 NFS: Network file system, a file-based storage protocol.
32 NSX: New technology virtualizing the network layer for VMware environments. Read more here.
33 NUMA: Non-uniform memory access, when multiple processors are involved their memory access is relative to their location.
34 NVRAM: A VM file storing the state of the VM BIOS.
35 Openstack: A cloud operating system that can leverage many hypervisors underneath, including ESXi.
36 OVA: Packaging of OVF, usually as a URL to download the actual OVF from a source Internet site.
37 OVF: Standards based format for delivering virtual appliances.
38 P2V: Physical to Virtual
39 PowerCLI: vSphere CLI that’s better than vCLI or vMA
40 pRDM: Physical mode raw device mapping, presents a LUN directly to a VM.
41 Quiesce: The act of quieting (pausing running processes) a VM, usually through VMware Tools.
42 Resource pool: A performance management technique, has DRS rules applied to it and contains one or more VMs, vApps, etc.
43 SAN: Storage area network, a shared storage technique for block protocols (Fibre Channel/iSCSI).
44 SAS: Drive type for local disks (also SATA).
45 Shares: Numerical value representing the relative priority of a VM.
46 SSD: Solid state disk, a non-rotational drive that is faster than rotating drives.
47 SSH to ESXi host: The administrative interface you want to use for troubleshooting if you can’t use the vSphere Client or vSphere Web Client.
48 Storage DRS Cluster: A collection SDRS objects (volumes, VMs, configuration).
49 Storage I/O Control: I/O prioritization for VMs.
50 Storage vMotion: A VM storage migration technique from one datastore to another.
51 Transparent page sharing: A memory management technique; eliminates duplicate blocks in host memory.
52 V2V: Virtual to Virtual
53 VAAI: vStorage APIs for Array Integration, the ability to offload I/O commands to the disk array.
54 VADP: vSphere APIs for Data Protection, a way to leverage the infrastructure for backups.
55 vApp: • Group liked virtual machines together
• Common configuration within that group
• Startup process
• Resource Pools
56 vCenter Configuration Manager: Part of vCloud Suite that automates configuration and compliance for multiple platforms.
57 vCenter Linked Mode: A way of pooling vCenter Servers, typically across geographies.
58 vCenter Orchestrator: An automation technique for vCloud environments.
59 vCenter Server Heartbeat: Will keep the vCenter Server available in the event a host fails which is running vCenter.
60 vCenter Server: Windows Server that run vCenter to manage multiple ESXi servers
61 vCenter Single Sign on: Authentication construct between components of the vCloud Suite.
62 vCenter Site Recovery Manager: An automated solution to prepare for a site failover event for the entire vSphere environment.
63 vCLI: vSphere Command Line Interface, allows tasks to be run against hosts and vCenter Server.
64 vCloud Automation Center: IT service delivery through policy and portals, get familiar with vCAC.
65 vCloud Director: Application to pool vCenter environments and enable self-deployment of VMs.
66 vCloud Networking and Security: Part of the vCloud Suite; provides basic networking and security functionality.
67 vCloud Suite: The collection of technologies to deliver the VMware Software Defined Data Center.
68 vCSA: vCenter Server Appliance, Linux Server that run vCenter to manage multiple ESXi servers
69 VDI: Virtual desktop infrastructure, also called DaaS (Desktop as a Service) from Horizon View; run as ESXi VMs and with vSphere.
70 vDS: vNetwork Distributed Switch, an enhanced version of the virtual switch.
71 Virtual Appliance: A pre-packed VM with an application on it.
72 Virtual hardware version: A revision of a VM that aligns to its compatibility. vSphere 5.5 is HW ver 10, vSphere 6.0 is HW ver 11
73 Virtual NUMA: Virtualizes NUMA with VMware hardware version 8 VMs.
74 VM Snapshot: A point-in-time representation of a VM.
75 VM: Virtual Machine
76 vMA: vSphere Management Assistant,allows administrators to run scripts or agents that interact with ESX/ESXi and vCenter Server systems without having to explicitly authenticate each time. vMA can also collect ESX/ESXi and vCenter Server logs and store the information for analysis
77 VMDK: The virtual machine disk format, containing the operating system of the VM. VMware’s virtual disk format.
78 VMEM: The page file of the guest VM.
79 VMFS: Virtual Machine File System for ESXi hosts, a clustered file system for running VMs.
80 vmkernel: Officially the “operating system” that runs ESXi and delivers storage networking for VMs
81 vMotion: Moving a running virtual machine from one ESXi host to
another host without loss in connectivity.
• CPU support
• Enhanced vMotion Compatibility (EVC).
82 VMSD: VM file for storing information and metadata about snapshots.
83 VMSN: Snapshot state file of the running VM.
84 VMSS: VM file for storing suspended state.
85 VMTM: VM file containing team data.
86 VM-VM affinity: Sets rules so two VMs should run on the same ESXi host or stay separated.
87 VMware Compatibility Matrix: List of supported storage, servers, and more for VMware technologies.
88 VMware Tools: A set of drivers for VMs to work correctly on synthetic hardware devices. Read more on VMware Tools.
89 VMware vCenter Mobile Access (vCMA): virtual appliance that is required to manage your datacenter from mobile devices such as smartphones and tablets
90 VMX: VM configuration file.
91 VMXF: Supplemental configuration file for when VMs are used in a team.
92 VOVA: A VMware appliance to test OpenStack for vSphere
93 vRDM: Virtual mode raw device mapping, encapsulates a path to a LUN specifically for one VM in a VMDK.
94 vSA: vSphere Storage Appliance is a software-based shared storage solution that enables high availability and automation in vSphere without shared storage hardware
95 vSAN: Virtual SAN, a new VMware announcement for making DAS deliver SAN features in a virtualized manner.
96 vShield Zones: A firewall for vSphere VMs.
97 vSphere Client: Administrative interface of vCenter Server.
98 vSphere DRS: Distributed Resource Scheduler, service that manages performance of VMs.
99 vSphere Fault Tolerance: An availability technique to run the networking, memory and CPU of a VM on two hosts to accommodate one host failure.
100 vSphere folder: An organizational construct, a great way to administer permissions and roles on VMs.
101 vSphere HA: High Availability, will restart a VM on another host if it fails.
102 vSphere Licensing: Different features are available as the licensing level increases, from free ESXi to Enterprise Plus.
103 vSphere role: A permissions construct assigned to users or groups.
104 vSphere SDRS: Storage DRS, manages free space and datastore latency for VMs in pools.
105 vSphere Web Client: Web-based administrative interface of vCenter Server.
106 vSphere: Collection of VMs, ESXi hosts, and vCenter Server.
107 vSwitch: A virtual switch, places VMs on a physical network.
108 VUM: vSphere Update Manager, a way to update hosts and VMs with latest patches, VMware Tools and product updates.
109 VXLAN: VMs with a logical network across different networks.

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