OSD in a Ceph cluster are the workhorses; they perform all the work at the bottom layer and store the user data. Monitoring OSDs is a crucial task and requires a lot of attention as there are a lot of OSDs to monitor and take care of. The bigger your cluster, the more OSDs it will have, and the more rigorous monitoring it requires. Generally, a Ceph cluster hosts a lot of disks, so the chances of getting OSD failure is quite high. We will now focus on Ceph commands for OSD monitoring.
The tree view of OSD is quite useful to view OSD status such as IN or OUT and UP or DOWN. The tree view of OSD displays each node with all its OSDs and its location in a CRUSH map. You can check the tree view of OSD using the following command:
# ceph osd tree
This will display the following output:
This command displays various useful information for Ceph OSDs, such as weight, the UP/DOWN status, and the IN/OUT status. The output will be beautifully formatted as per your Ceph...