creation snapshot of aync option

[shozo]

During the test of snapshot creation of Flex volume, I've found async option in "snapshot-create" API.
As far as I know, there is no async option in ONTAP8.3.1P1 "snapshot create" command.
So how can I know whether this async option working?
Is there some kind of status which shows like "Snapshot creating..." or "Snapshot created" ?

<?xml version="1.0" encoding="UTF-8"?>
<netapp  xmlns="http://www.netapp.com/filer/admin" version="1.31">
  <snapshot-create>
    <async>true</async> ★
    <snapshot>test_snap
    </snapshot>
    <volume>volume_iscsi</volume>
  </snapshot-create>
</netapp>

[Sahana]

Hi,

In clustered Data ONTAP 8.2 data protection (DP) relationships were used for mirroring, while extended data protection (XDP) relationships were used for backup/vaulting. In clustered Data ONTAP 8.3 extended data protection (XDP) relationships support two more use cases, mirroring and unified mirror-vault. The exact behavior of an extended data protection (XDP) relationship is governed by the snapmirror policy associated with that relationship. In clustered ONTAP 8.3 the snapmirror policy has a new field type to indicate how the relationships with that policy will behave. The supported types are async-mirror (mirroring), vault (vaulting/backup) and mirror-vault (unified mirroring and vault). Refer to the man page for the snapmirror policy create command for more information.