Snapshot Auto Delete

Hello my customer has been having issues as his NDMP fails due to his volume hitting the maximum snapshot state and is unable to create new snapshots.

I remember setting this volume up with snapshot auto delete configured. But I have to manually delete a large set of snapshots every month as the Snapshot Auto delete is not working.  do I need to change the target free space past 20%?

this is the output for vol status -v

Re: Snapshot Auto Delete

What is the constraint? There are 255 snapshots being created? Or some size issue? You can change the trigger from volume to snapshot space if that helps.

How are the snapshots being created?