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Hypervisor Types
  • Type 1 – Bare metal hypervisor
Example : Vmware, Hyper-v, Xen
  • Type 2 – host OS + Hypervisor
Example : Vmware workstation, player
what is the difference between ESXI and ESX
The functionlity and performance of VMware ESX and ESXi are the same; the difference
between the two hypervisors resides in their packaging architecture and operatiional
management.VMware ESXi is the latest hypervisor architecture from VMware.
Last Update:Jun 1,2009
  • What is VMware ESX ?

    ESX (Elastic Sky X) is the VMware’s enterprise server virtualization platform. In ESX, VMkernel is the virtualization kernel which is managed by a console operating system which is also called as Service console. Which is Linux based and its main purpose is it to provide a Management interface for the host and lot of management agents and other third-party software agents are installed on the service console to provide the functionalists like hardware management and monitoring of ESX hypervisor.
  • What is VMware ESXi?

    ESXi (Elastic sky X Integrated) is also the VMware’s enterprise server virtualization platform. In ESXi, Service console is removed. All the VMware related agents and third party agents such as management and monitoring agents can also run directly on the VMkernel. ESXi is a ultra-thin architecture which is highly reliable and its small code-base allows it to be more secure with fewer codes to patch. ESXi uses Direct Console User Interface (DCUI) instead of a service console to perform management of ESXi server. ESXi installation will happen very quickly as compared to ESX installation.
  • The first step in the vCenter Simple Install process is to install vCenter Single Sign On. Authentication by vCenter Single Sign On makes the VMware cloud infrastructure platform more secure by allowing vSphere software components to communicate with each other through a secure token exchange mechanism.
  • Inventory Service stores vCenter Server application and inventory data, which lets you search and access inventory objects across linked vCenter Server instances.
  • The vSphere Web Client runs in your browser and lets you manage your vSphere environment.
  • From 5.0 onwards vcenter available in windows server and appliance
  • vCenter Server 5.x requires a 64-bit operating system and cannot be installed on a 32-bit operating system
  • Microsoft SQL server Database Support:
  • Oracle Database Support:
  • IBM DB2 9 Support:
The VMware vMotion process is completed in three steps:
  • The virtual machine health is verified to be stable by vCenter Server
  • The memory, registers, and network connections are copied to the target host (virtual machine state)
  • The virtual machine is then able to resume operations on the new target host
There are a few considerations to be made in preparing the VMware ESXi host for vMotion. They include:
  • CPU architecture is compatible between the source and target ESXi host
  • Access to the datastores on which the virtual machine VMDKs are located
  • If using VMware Standard vSwitches (VSS), virtual switches need to be labeled the same. This ensures network connectivity is maintained with the vMotion process for the virtual machine between hosts
  • Making sure the virtual switch physical network connections and their respective network labels are consistent across the ESXi hosts
  • VMware vMotion requires at least a gigabit network connection
A vmkernel port must be enabled with the vMotion service
Storage vMotion
  • What are the requirements of storage vMotion? The following must be considered:
  • VM disks must be persistent mode or RDMs
  • If VMware Tools is in the process of installing on a virtual machine, the virtual machine cannot be storage vMotioned
  • VMFS versions need to be considered. If moving from a newer version of VMFS to an older, the virtual disk sizes must be considered
  • The host must be licensed for storage vMotion
  • VMware vSphere hosts running ESXi 4.0 and later do not have to have vMotion configured to perform storage vMotion
  • VMware Enhanced vMotion CompatibilityStarting in vSphere 5.1, VMware enabled the Enhanced vMotion Compatibility or EVC mode. The enhanced vMotion compatibility allows vMotion operations between dissimilar processors in ESXi hosts within the same cluster.