This appendix collects together answers to a selection of Frequently Asked Questions that can be helpful in solving various issues with cOS Core running under KVM.

Question Summary

1. The two hour cOS Core demo mode time limit has expired. What do I do?
2. Are upgrades of cOS Core done differently under KVM?
3. How do I release the focus from the KVM console window?
4. Do all virtual interfaces have to be configured as virtio NICs?
5. How do I manage multiple virtual firewalls?
6. How much increase in throughput can SR-IOV provide?

Questions and Answers

1. The two hour cOS Core demo mode time limit has expired. What do I do?

cOS Core will not respond after it enters lockdown mode after two hours and will consume all the KVM resources. In this situation, the KVM virtual machine must be stopped and then restarted so that cOS Core restarts and enters a new two hour evaluation period.

2. Are upgrades of cOS Core done differently under KVM?

No. cOS Core upgrades are performed under KVM just as they would be in non-KVM environments.

3. How do I release the focus from the KVM console window?

KVM keeps focus in the console window. To click outside the console window, press the key combination Ctrl-Alt .

4. Do all virtual interfaces have to be configured as virtio NICs?

Yes. cOS Core will not work with virtual interfaces that are not configured to use the virtio driver. Any added interfaces must have the Device model property set to virtio.

5. How do I manage multiple virtual firewalls?

The IP address of the management virtual Ethernet interface for cOS Core must be different for the different virtual firewalls running under a single hypervisor.

6. How much increase in throughput can SR-IOV provide?

The performance increase provided by SR-IOV can be dramatic if traffic both enters and leaves via SR-IOV interfaces. A quadrupling of maximum throughput is possible.