QEMU KVM Libvirt手册(10): KVM的各种限制
Overcommits[*]KVM allows for both memory and disk space overcommit.
[*]However, hard errors resulting from exceeding available resources will result in guest failures.
[*]CPU overcommit is also supported but carries performance implications.
Time Synchronization
[*]kvm-clock
[*]NTP or similar network based time keeping protocols are also highly recommended (for VM Host Server and VM Guest) to help maintain a stable time.
[*]Running NTP inside the guest is not recommended when using the kvm-clock .
MAC addresses
[*]If no MAC address is specified for a NIC, a default MAC address will be assigned.
[*]This may result in network problems when more than one NIC receives the same MAC address.
[*]It is recommended to always assure a unique MAC address has been assigned for each NIC.
Live Migration
[*]Live Migration is only possible between VM Host Servers with the same CPU features and no physical devices passed from host to guest.
[*]Guest storage has to be accessible from both VM Host Servers and guest definitions need to be compatible.
[*]VM Host Server and VM Guests need to have proper timekeeping installed.
User Permissions
[*]The management tools (Virtual Machine Manager, virsh, vm-install) need to authenticate with libvirt
Suspending/Hibernating the VM Host Server
[*]Suspending or hibernating the VM Host Server system while guests are running is not supported.
Performance
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