smartos update_disks

I want to change the disk model in a KVM machine on SmartOS.

vi upddisk.json

  {
   "update_disks": [
    {
     "path": "/dev/zvol/rdsk/zones/e888a82a-bca1-49fda6d7-988debb09703-disk0",
     "model": "ide"
    }
   ]
  }

vmadm update e888a82a-bca1-49fd-a6d7-988debb09703 -f upddisk.json

vmadm get  e888a82a-bca1-49fd-a6d7-988debb09703