This seems to work okay. Note that I've used NodeID to avoid having to use joins and make the subqueries longer. There's probably a better way of doing this, but this is perhaps the easiest to follow & expand on for people who aren't familiar with SQL.You might want to add additional conditions with RESPONDING = 'Y' to avoid triggering the alert when a volume is renamed or when Orion misses a poll etc.
I'm not going to even try adding multiple volume info bits to alert emails, because it's a pain in the nuts to get it working properly.
