The best way to check is to check the ONTAP release date from the Download site, and use a Trident version that came after (if possible). For any ONTAP below 9.15, is will revert to using ONTAPI to ac...The best way to check is to check the ONTAP release date from the Download site, and use a Trident version that came after (if possible). For any ONTAP below 9.15, is will revert to using ONTAPI to access ONTAP for the needed functionality, which works with most ONTAP 9 releases, ONTAP 9.15.1 and above are still better off if you set the backend "useREST" option to "false"; when REST API is the only option, it will be used nonetheless.
