Dynamically Reconfiguring a Block Device

[Henry lol]

Hello,

I want to dynamically reconfigure a block device, as described on page
28 of https://www.linux-kvm.org/images/d/d5/02x07a-Blockdev.pdf.
More specifically, I want to take a live snapshot and add an I/O
throttling filter.

I found that the QMP feature x-blockdev-change can reconfigure the
device, but it seems to support only the Quorum driver.
Is there any other way to achieve this?

Sincerely,

Re: vnc server screen resolution/geometry for a linux guest and host

[Jakob Bohm via]

On 3/10/2025 15:10:08, phani rithvij wrote:

When starting qemu can I set the geometry option for the vnc server it
starts? (-vnc unix:/tmp/qemu-vnc,...)
or what can I do to make the vnclient I use, choose a specific resolution?
The Qemu VNC resolution is whatever is the resolution of the (virtual) 
monitor

attached to the (virtual) display adapter in the virtual machine. If the OS
on the virtual machine chooses a different resolution (such as VGA 
resolution)

according to its own settings and tools, this will carry through to the VNC
resolution .

So to get a desired resolution, you need to look at options describing the
(virtual) display device and options that can be set in the guest OS, 
such as

the Linux bootstrap options setting the resolution of the text tty's and/or
any loaded graphics software .

I am unsure which qemu options control the (virtual) monitor capabilities
reported to the Guest (virtual) machine via mechanisms such as (virtual)
display DDC data values .


I am running a linux vm on a baremetal linux, no windows involved.



Enjoy

Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S.  https://www.wisemo.com
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vnc server screen resolution/geometry for a linux guest and host

[phani rithvij]

When starting qemu can I set the geometry option for the vnc server it
starts? (-vnc unix:/tmp/qemu-vnc,...)
or what can I do to make the vnclient I use, choose a specific resolution?

I am running a linux vm on a baremetal linux, no windows involved.