[ceph-users] best use of NVMe drives

Hi there, we are in the process of growing our Nautilus ceph cluster. Currently, we have 6 nodes, 3 nodes with 2×5.5TB, 6x11TB disks and 8x186GB SSD and 3 nodes with 6×5.5TB and 6×7.5TB disks. All with dual link 10GE NICs. The SSDs are used for the CephFS metadata pool, the hard drives are used for the CephFS data pool. All OSD journals are kept on the drives themselves. Replication level is 3 for both data and metadata pools. The new servers have 12x12TB disks and 1 1.5TB NVMe drive. We expect to get another 3 similar nodes in the near future. My question is what is the most sensible thing to do with the NVMe drives. I would like to increase the replication level of the metadata pool. So my idea was to split the NVMes into say 4 partitions and add them to the metadata pool. Given the size of the drives and the metadata pool usage (~35GB) that seems overkill. Would it make sense to partition the drives further and stick the OSD journals on the NVMEs? Regards magnus The University of Edinburgh is a charitable body, registered in Scotland, with registration number SC005336.