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

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Processor

The Ceph monitor daemon maintains the cluster maps and does not serve any data to the client, hence it is lightweight and does not have very strict processor requirements. In most cases, an average single core server processor will do the job for the Ceph monitor. On the other hand, the Ceph MDS is a bit more resource hungry. It requires significantly higher CPU processing power with quad core or better. For a small Ceph cluster or proof of concept environment, you can co-locate Ceph monitors with other Ceph components such as the OSD, RADOS Gateway, or even the Ceph MDS. For a medium-to-large-scale environment, instead of being shared, Ceph Monitors should be hosted on dedicated machines.

A Ceph OSD daemon requires a fair amount ...

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