# Glossary

- CPU: Processor
- HA: High Availability
- HVM: Hardware virtualization
- MTU: largest size packet that can be sent in the network
- OS: Operating System
- PIF: Physical Network Interface
- PVM: Paravirtualization
- SR: Storage Repository
- vCPU: Virtual Processor
- VDI: Virtual Disk Image
- VIF: Virtual Network Interface
- VM: Virtual Machine
- XO: Xen Orchestra
- XOA: Xen Orchestra Appliance