The VMs are XenServer VMs with virtual Disk saved at the NFS Server which has the RBD mounted … So there is nor migration from my POV as there is no second storage to migrate to ...
All your pain is self-inflicted.
Just FYI clients are not interrupted when you upgrade ceph. Client will
be interrupted only when update, so if you (suddenly) change crush
tunables, minimum_required_version for example (for this reason clients
must be upgraded before cluster).
k
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