I am running some legacy OSes (Windows 10, …) inside libvirt/KVM virtual machines and since I got my new 4K displays (hello Home Office), I was annoyed that I could not full-screen them on the large displays.

So finally I took some time to investigate and quickly (to my surprise) found the solution. As if we were back in the 1990ties, I did not provide the virtual machine with enough video RAM to properly go to the higher resolutions.

General note concerning the use of guest agent interfaces:

"unsupported" is a higher-level error than the errors that individual commands might document. The caller should always be prepared to receive QERR_UNSUPPORTED, even if the given command doesn’t specify it, or doesn’t document any failure mode at all.

On layer 2 networks, high availability can be achieved by:

• antique protocols, like the Spanning Tree Protocol,
• proprietary protocols, like Juniper’s virtual chassis, Cisco’s virtual port channel and other MC-LAG implementations,1
• standardized protocols, like Shortest Path Bridging Protocol or TRILL, or
• the underlying network (in the case of an overlay network, like VXLAN).

Simple yet Powerful Turnkey Solution to Build Clouds and Manage Data Center Virtualization

Mirage OS is a library operating system that constructs unikernels for secure, high-performance network applications across a variety of cloud computing and mobile platforms. Code can be developed on a normal OS such as Linux or MacOS X, and then compiled into a fully-standalone, specialised unikernel that runs under the Xen hypervisor.