Simple definition
A virtual machine behaves like a complete computer, but it works inside a server thanks to a hypervisor.
Technical definition
It has virtual processors, memory, disks and network interfaces presented by the hypervisor. Several VMs can share the same hardware while remaining logically separated.
What is it used for ?
Consolidate servers, test systems and simplify recovery or migration.
Practical example
A single physical server hosts an Active Directory VM, an Applicative VM and a VM of files.
Common issues
- Upon allocation of resources
- S Narratives
- Saturated storage
- Backup not suitable for virtualization
Related terms
Hypervisor · Backup · Replication · RAID · Cloud computing
Key takeaway: This entry explains the general operation of the term. Exact settings may vary depending on software, vendors and environments.