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

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Memory

Monitor and MDS daemons need to serve their data rapidly, hence they should have enough memory for faster processing. The rule of thumb is to have 2 GB or more memory per daemon instance—this should be good for Ceph MDS and monitors in smaller Ceph clusters. Larger Ceph clusters should look to increase this amount. Ceph MDS depends on a lot on data caching; as they need to serve data quickly, they require plenty of RAM. The higher the RAM for Ceph MDS, the better the performance of Ceph FS will be.

OSDs generally require a fair amount of physical memory. For an average workload, 1 GB of memory per OSD daemon instance should suffice. However, from a performance point of view, 2 GB per OSD daemon is a good choice, and having more memory ...

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