See https://hpc.lenovo.com/users/hpc/update/2021/12/15/21crelease.html for details. The big new thing is a new stateless implementation. Of some relevance to recent discussions on this list, there's no 'geninitrd', instead the natural Dracut in the image builds the initramfs, making for easier customization, or at least customization that's the same for diskless as it would be for diskful.
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