On Mon, Mar 18, 2019 at 09:08:31AM -0600, Alan Somers wrote:

Do you mean using a zvol as the backing store for a VM?  If so, then:
1) Yes.  You can just do "zfs set volsize" on the host.
2) In theory no, but the guest may need to be rebooted to notice the
change.  And I'm not sure if the current bhyve code will expose the
new size without a reboot or not.
3) Sure.  But after you expand the zvol (or before you shrink it),
you'll have to change the size of the guest's filesystem using the
guest's native tools.

Great, that's awesome. Thanks for clarifying --
J.

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