Hi Loic, In Red Hat we're interested in having a Ceph "facts" file that we can integrate with RHEL's subscription-manager (upstream http://www.candlepinproject.org/ fyi) in order to report on the available raw disk capacity available per OSD. We need a script to write a "/etc/rhsm/facts/ceph_disk.facts" file. That file needs to contain JSON of the form: { "band.storage.usage": <integer number of TB used on this node, such as 55> } for example: { "band.storage.usage": 55 } As long as that file exists (and it can be named anything that ends in ".facts") the contents will be read in and added to the system facts. On RHEL this can be verified by running `subscription-manager facts` to ensure that your value is showing up properly. In terms of creating this .facts file, we will need a script to do that. We could call it /usr/bin/ceph-update-fact-file, or make it a ceph-disk sub-command, or whatever you want, really. The facts file should be kept up-to-date every four hours, which makes me think that we could implement this as a systemd service and timer. Something like $ cat /etc/systemd/system/ceph-update-facts-file.service [Unit] Description=Update Ceph OSD fact file [Service] Type=oneshot ExecStart=/usr/bin/ceph-update-fact-file ...and: $ cat /etc/systemd/system/ceph-update-facts-file.timer [Unit] Description=Trigger an automatic rewrite every four hours [Timer] OnCalendar=4hours Persistent=true [Install] WantedBy=multi-user.target (The above is untested, it's just an idea). What do you think? -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
