On 03/01 21:41, Dave Hall wrote: > Hello, > > I've had a look at the instructions for clean shutdown given at > https://ceph.io/planet/how-to-do-a-ceph-cluster-maintenance-shutdown/, but > I'm not clear about some things on the steps about shutting down the > various Ceph components. > > For my current 3-node cluster I have MONs, MDSs, MGRs, and OSDs all running > on the same nodes. Also, this is a non-container installation. > > Since I don't have separate dedicated nodes, as described in the referenced > web page, I think the instructions mean that I need to issue SystemD > commands to stop the corresponding services/targets on each node for the > Ceph components mentioned in each step. Yep, the systemd units are usually named 'ceph-<daemon>@<id>', for example 'ceph-osd@45' would be the systemd unit for osd.45. > > Since we want to bring services up in the right order, I should also use > SystemD commands to disable these services/targets so they don't > automatically restart when I power the nodes back on. After power-on, I > would then re-enable and manually start services/targets in the order > described. Also yes, and if you use some configuration management or similar that might bring them up automatically you might want to disable it temporarily too. > > One other specific question: For step 4 it says to shut down my service > nodes. Does this mean my MDSs? (I'm not running any Object Gateways or > NFS, but I think these would go in this step as well?) Yes, that is correct. Monitor would be the MONs, and admin the MGRs. > > Please let me know if I've got this right. The cluster contains 200TB of a > researcher's data that has taken a year to collect, so caution is needed. Can you share a bit more about your setup? Are you using replicas? How many? Erasure coding? (a ceph osd pool ls detail , ceph osd status or similar can help too). I would recommend trying to get the hand of the process in a test environment first. Cheers! > > Thanks. > > -Dave > > -- > Dave Hall > Binghamton University > kdhall@xxxxxxxxxxxxxx > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx -- David Caro SRE - Cloud Services Wikimedia Foundation <https://wikimediafoundation.org/> PGP Signature: 7180 83A2 AC8B 314F B4CE 1171 4071 C7E1 D262 69C3 "Imagine a world in which every single human being can freely share in the sum of all knowledge. That's our commitment."
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