[ceph-users] DB/WALL and RGW index on the same NVME

Hi! I'm working on a POC cluster setup dedicated to backup app writing objects via s3 (large objects, up to 1TB transferred via multipart upload process). Initial setup is 18 storage nodes (12HDDs + 1 NVME card for DB/WALL) + EC pool. Plan is to use cephadm. I'd like to follow good practice and put the RGW index pool on a no-rotation drive. Question is how to do it? - replace a few HDDs (1 per node) with a SSD (how many? 4-6-8?) - reserve space on NVME drive on each node, create lv based OSD and let rgb index use the same NVME drive as DB/WALL Thoughts? -- Lukasz