Review Flashcards
Virtual Machines
A software representation of a physical computer and its components.
Virtualization software converts the physical machine and its components into files.
What does the Software Defined Infrastructure include?
- Datacenter
- Cluster
- Server / Host
- VMs
- Networking
- Storage
Virtualization
The process of creating a software-based representation of something physical.
The single most effective way to reduce IT expenses while boosting efficiency and agility for all business sizes.
vSphere and Cloud Computing
Cloud computing exploits the efficient pooling of an on-demand, self-managed, and virtual infrastructure
Types of Virtualization
Hypervisor Type 2 (hosted)
Hypervisor Type 1 (bare-metal)
Hypervisor Type 2 (Hosted)
An application that runs on top of the OS.
Ex. VMware Workstation, VMware Fusion, etc.
Hypervisor Type 1 (Bare-Metal)
Does not require a “traditional” OS.
VMkernel is the hypervisor on an ESXi host
CPU Virtualization
Emphasizes performance and runs directly on the available CPUs
Virtualized Host Memory Usage
Emphasizes performance and runs directly on the available RAM
Key virtual networking components
Virtual Ethernet adapters and virtual switches
Thick-Provisioned Virtual Disks
Use all the defined disk space at their creation regardless of the amount of data in the guest OS file system.
Eager-Zeroed Thick-Provisioned
Every block is prefilled with a zero
Lazy-Zeroed Thick-Provisioned
Every block is filled with a zero when data is written to the block
Thin-Provisioned Virtual Disks
Consume only the capacity needed to hold the current files, thus enables VMs to use storage space as needed
Virtual Networks
Enable communication between VMs and physical machines
