is it possible to convert dataset to sparse volume (thin provisioning)?

Xdg asked:

I’ve created ZFS datasets and installed virtual servers into them. Suddenly my ZFS volume free space is gone, but not all space is used in each dataset. I want to introduce thin provisioning (use ZFS sparse volume).

Is it possible to convert datasets into sparse volumes without deleting them? Thanks.

My answer:

As far as I know it’s not possible to convert an existing zvol to sparse; they must be created sparse to begin with.

However, you can create a new sparse zvol, and zfs send from the old one and zfs recv to the new one, and then swap their names.

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