Please read to the end of my comment - it appears what DigitalOcean is doing is giving the VM access to a logical device that is preallocated. Perhaps carved out of LVM or MD or some other logical disk. KVM's default behavior when using these sorts of devices is to present to the VM whatever data already existed at the lower level.
Er, I fully read your comment when it was 7 minutes old, but it looks like you've edited it significantly since then to fill in some missing details. Thank you for explaining, I appreciate it!
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Please read to the end of my comment - it appears what DigitalOcean is doing is giving the VM access to a logical device that is preallocated. Perhaps carved out of LVM or MD or some other logical disk. KVM's default behavior when using these sorts of devices is to present to the VM whatever data already existed at the lower level.
Er, I fully read your comment when it was 7 minutes old, but it looks like you've edited it significantly since then to fill in some missing details. Thank you for explaining, I appreciate it!
Apologies then, glad I was able to answer your question with the subsequent edit. :)