Hello, In some documentation I was reading last night about laying out OSDs, it was suggested that if more that one OSD uses the same NVMe drive, the failure-domain should probably be set to node. However, for a small cluster the inclination is to use EC-pools and failure-domain = OSD. I was wondering if there is a middle ground - could we define failure-domain = NVMe? I think the map would need to be defined manually in the same way that failure-domain = rack requires information about which nodes are in each rack. Example: My latest OSD nodes have 8 HDDs and 3 U.2 NVMe. I'd set up the WAL/DB for with HDDs per OSD (wasted space on the 3rd NVMe). Across all my OSD nodes I will have 8 HDDs and either 2 or 3 NVMe devices per node - 15 total NVMe devices. My preferred EC-pool profile is 8+2. It seems that this profile could be safely dispersed across 15 failure domains, resulting in protection against NVMe failure. Please let me know if this is worth pursuing. Thanks. -Dave -- Dave Hall Binghamton University kdhall@binghamton.edu 607-760-2328 (Cell) 607-777-4641 (Office)