Doing well so far, because the api 'volume-list-info' seems to have most of the information I want.
There's just one thing missing - how much of the 'snap reserve' I'm actually using. 

I can't seem to find it in either that, or the 'snapshot' counters. I would ideally be able to do this without having to do a per-volume calculation, because one of the things I'm hoping to do is support a lightweight proxy client that 'just' fetches source XML for processing on a server. 

Or is there a way I can calculate this from the size/used/available in the volume-list-info? 

Thanks,
Ed