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One way to do the thin provisioning would be to direct the data flow to LVM. But a file system with OCI features would give us much richer functionality. And the fs of choice is zfs (unfortunately there is not many file systems satisfying the requirements, currently the list is limited btrfs and bcachefs - the former still is not stable enough especially when it comes to software raid support, the latter is very promising but has to go a long way to become mature).
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Intermediate step
While the efforts on NVMe vhost already started, and the first prototype is approaching, we still require time to upstream these efforts, and bring implementation up to production level (extensive testing and performance tuning).
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