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Learning Ceph - Second Edition by Karan Singh, Vaibhav Bhembre, Anthony D'Atri

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Summary

There are many factors that influence selection of server hardware for Ceph clusters, and each type of node has different requirements and constraints. Among the most important points to consider are network speed and failure domains. When planning for Ceph capacity, it is important to remember that one cannot run the OSD drives right up to 99% full; it is prudent to plan for a cluster to not exceed 70% utilization of raw OSD space.

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