VMware vSphere 4 Technical Information download pdf (Page 44)

Performance Best Practices for VMware vSphere 4.0

44 VMware, Inc.

EPT (Extended Page Tables)

Intel’s implementation of hardware virtual MMU.

F Fault Tolerance (FT)

A feature in vSphere 4.0 that runs a secondary copy of a virtual machine on a secondary host and

seamlessly switches to that secondary copy in the event of failure of the primary host.

Fibre Channel

A networking technology used for storage. See also iSCSI, NAS, NFS, and SAN.

Full Clone

A copy of the original virtual machine that has no further dependence on the parent virtual machine. See

also Linked Clone.

G Growable Disk

A type of virtual disk in which only as much host disk space as is needed is initially set aside, and the disk

grows as the virtual machine uses the space. Also called thin disk. See also Preallocated Disk.

Guest

A virtual machine running within VMware Workstation. See also Virtual Machine.

Guest Operating System

An operating system that runs inside a virtual machine. See also Host Operating System.

H Hardware Abstraction Layer (HAL)

A layer between the physical hardware of a computer and the software that runs on that computer

designed to hide differences in the underlying hardware, thus allowing software to run on a range of

different architectures without being modified for each one. Windows uses different HALs depending,

among other factors, on whether the underlying system has one CPU (Uniprocessor (UP) HAL) or

multiple CPUs (Symmetric Multiprocessor (SMP) HAL). See also Kernel.

Hardware Virtual MMU

A feature of some recent CPUs that performs virtualization of the memory management unit (MMU) in

hardware, rather than in the virtualization layer. Also called RVI or NPT by AMD and EPT by Intel.

Hardware Virtualization Assist

See Virtualization Assist.

High Availability (HA)

VMware High Availability is a product that continuously monitors all physical servers in a resource pool

and restarts virtual machines affected by server failure.

Host Bus Adapter (HBA)

A device that connects one or more peripheral units to a computer and manages data storage and I/O

processing (often for Fibre Channel, IDE, or SCSI interfaces).An HBA can be physical (attached to a host)

or virtual (part of a virtual machine).

Hyper-Threading

A processor architecture feature that allows a single processor to execute multiple independent threads

simultaneously. Hyper-threading was added to Intel's Xeon and Pentium® 4 processors. Intel uses the

term “package” to refer to the entire chip, and “logical processor” to refer to each hardware thread. Also

called symmetric multithreading (SMT).

I Independent Virtual Disk

Independent virtual disks are not included in snapshots. Independent virtual disks can in turn be either

Persistent or Nonpersistent.

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