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Ceph Cookbook - Second Edition by Karan Singh, Michael Hackett, Vikhyat Umrao

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Troubleshooting placement groups

As with the Ceph daemons issues, placement group issues will usually first be seen in the ceph health detail or status commands. They are usually accompanied by OSDs that are in a down state or a clock skew issue on the monitors. Prior to moving forward with troubleshooting, placement groups validate that all of your Ceph monitors are up and in quorum and that all Ceph OSDs are in the up/in state. The upcoming recipes will show you how to troubleshoot some of the more common Ceph placement group issues you may come across in your Ceph cluster.

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