Hi,
ceph uses a pseudo random distribution within crush to select the target
hosts. As a result, the algorithm might not be able to select three
different hosts out of three hosts in the configured number of tries.
The affected PGs will be shown as undersized and only list two OSDs
instead of three.
The best solution is adding more host, the second best is changing crush
parameters (number_of_tries etc.) until the algorithm gives better results.
Ceph clusters with few hosts often require manual tuning to work reliably.
Regards,
Burkhard
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