[ceph-users] stretched cluster new pool and second pool with nvme

hi ... running against the wall, i need your help, again. our test stretched cluster is running fine. now i have 2 questions. whats the right way to add another pool? create pool with 4/2 and use the rule for the stretched mode, finished? the exsisting pools were automaticly set to 4/2 after "ceph mon enable_stretch_mode". the second question, we want to use ssd and nvme together. so, we need to have a second pool for class nvme. i don't know, how to setup a second crush rule for the nvme class. i thought, that i need to filter with 2 rules for the classes. is that correct? thanks for help, ronny