Hi, is it a problem that the device class for all my disks is SSD even all of these disks are NVME disks? If it is just a classification for ceph, so I can have pools on SSDs and NVMEs separated I don't care. But maybe ceph handles NVME disks differently internally? I've added them via ceph-volume lvm create --bluestore --data /dev/nvme2n1 and they only show up as ssd root@a0423f621aaa:~# ceph osd metadata osd.0 { "id": 0, "arch": "x86_64", ... "bluefs": "1", "bluefs_dedicated_db": "0", "bluefs_dedicated_wal": "0", "bluefs_single_shared_device": "1", "bluestore_bdev_access_mode": "blk", "bluestore_bdev_block_size": "4096", "bluestore_bdev_dev_node": "/dev/dm-2", "bluestore_bdev_devices": "nvme0n1", "bluestore_bdev_driver": "KernelDevice", "bluestore_bdev_partition_path": "/dev/dm-2", "bluestore_bdev_rotational": "0", "bluestore_bdev_size": "1920378863616", "bluestore_bdev_support_discard": "1", "bluestore_bdev_type": "ssd", "ceph_release": "pacific", "ceph_version": "ceph version 16.2.13 (5378749ba6be3a0868b51803968ee9cde4833a3e) pacific (stable)", "ceph_version_short": "16.2.13", "ceph_version_when_created": "ceph version 16.2.13 (5378749ba6be3a0868b51803968ee9cde4833a3e) pacific (stable)", "cpu": "Intel(R) Xeon(R) Gold 6226R CPU @ 2.90GHz", "created_at": "2023-06-20T14:03:35.167741Z", "default_device_class": "ssd", "device_ids": "nvme0n1=SAMSUNG_MZQLB1T9HAJR-00007_S439NF0M506164", "device_paths": "nvme0n1=/dev/disk/by-path/pci-0000:5e:00.0-nvme-1", "devices": "nvme0n1", "distro": "ubuntu", "distro_description": "Ubuntu 20.04.6 LTS", "distro_version": "20.04", ... "journal_rotational": "0", "kernel_description": "#169-Ubuntu SMP Tue Jun 6 22:23:09 UTC 2023", "kernel_version": "5.4.0-152-generic", "mem_swap_kb": "0", "mem_total_kb": "196668116", "network_numa_unknown_ifaces": "back_iface,front_iface", "objectstore_numa_node": "0", "objectstore_numa_nodes": "0", "os": "Linux", "osd_data": "/var/lib/ceph/osd/ceph-0", "osd_objectstore": "bluestore", "osdspec_affinity": "", "rotational": "0" } Cheers Boris