I work at Red Hat and a customer moving 40k servers off VMware is a fairly regular occurrence. It'd be one of the larger migrations but certainly not unusual. We can usually do about 500-1000 guests per day once the migration is fully underway after the initial engagement and a qualification period where the VMs get scoped for anything unusual / difficult to move.

It's all based around open source projects virt-v2v and Migration Toolkit for Virt, and the typical target is OpenShift Virtualization.

There are various zero-copy options if you're using specific storage. In the best case the downtime for each guest can be as little as a few minutes. If the storage stars don't align then it can take a few hours per VM (but conversions happen in parallel, dozens or hundreds at a time).

[I don't have any specific knowledge about where this Tesco account is going. We have plenty of competitors. Everyone is dining at the Broadcom trough right now. Broadcom's "strategy" is absolutely baffling to me.]

Edit: Almost forgot that I gave a 5 minute lightning talk about it: https://pretalx.com/devconf-cz-2024/talk/SN93LG/

> A lot of work ahead.

Lots of orgs have been documenting their moves to KubeVirt over the past year or so. There's KubeCon video recordings on the youtube channel from Amsterdam with lots of this kind of stuff, especially from european end users.

One thing I find consistent is orgs are also looking at the whole stack, this is just another major component of digital sovereignty.

Disclaimer: work for CNCF on this but worked on the first version of VMWare Tanzu so every announcement in this space is interesting lol.