# 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