The tree view in OSD is quite useful for knowing OSD statuses such as in or out and up or down. The tree view in OSD displays each node with all its OSDs and its location in the CRUSH map. You can check the tree view of OSD by using the following command:
# ceph osd tree
This command displays various useful information for Ceph OSDs, such as WEIGHT, UP/DOWN status, and in/out status. The output will be beautifully formatted as per your Ceph CRUSH map. If you were maintaining a big cluster, this format would be beneficial to locating your OSDs and their hosting server from a long list.