space-guarantee while calling volume-create function

I need help  on netapp-manageability-sdk . When i open module with volume-create function. I did not find attribute of space-guarantee . but could the find the under space-guarantee funcation. I dodnot know what is different between  volume-create and volume-create-async . I chnage my code to read volume-create-async funcation , but fails telling i need to specify aggr .


'space-guarantee' => {
'type' => 'string',
'flags' => 4,
'scope' => [],



'volume-create-async' => {
'category' => 'volume',
'family' => ['ontap-vserver'],



Any help or suggestion  ?