Which of the following are benefits of server virtualization? (Choose four.)
- reduces maintenance downtime
- reduces facility expenses
- can aid configuration standardization
- reduces network bandwidth hot spots
- can grow and shrink based on resource need
Server virtualization can reduce maintenance downtime. Server virtualization is the process of using a virtual machine (VM) hypervisor to create and maintain multiple server VMs on a single hardware server. Because server VMs can be migrated from one hypervisor to another without powering down the VM, maintenance on a hypervisor’s host need not hinder virtualized server availability.
Server virtualization can grow and shrink based on resource need. This feature is known as elasticity and is commonly used by cloud-based virtual servers. A virtual server that requires more hardware resources can grow to consume those resources and shrink when those resources are no longer required.
Server virtualization can reduce facility expenses. When servers are virtualized, it is not necessary to purchase new hardware for each new server that is deployed at the facility. Instead, new servers can be quickly instantiated on existing hardware, thereby eliminating the cost of purchasing additional hardware.
Server virtualization can aid configuration standardization. Because VMs can be cloned, administrators can create what is known as a golden image, which is a single VM that is equipped with a standardized, secure configuration. This golden image can then be cloned to create new VMs that are already equipped with that standard, secure configuration. Deploying and instantiating VMs that are already configured with a standard, secure configuration reduces administrative overhead and prevents accidental deployment of an insecure configuration.
Server virtualization causes, not reduces, network bandwidth hot spots. Therefore, reducing network bandwidth hot spots is not a benefit of server virtualization. Because all the VMs are using the same physical network connection, it is possible that required network bandwidth could surpass network capacity. It is therefore important that VM administrators understand the network demands of each VM installed on a given physical server and migrate or deploy new VMs on new hardware as necessary.