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

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Storage drive capacity

Less capacious drive models are often attractive from a price/GB (or price/TB) angle than each generation's densest monsters, but there are other factors. Every drive needs a bay to live in and a controller / HBA / expander channel. Cheap drives are no bargain if you have to acquire, manage, rack, power, and cool double the number of servers in order to house them.

You may also find that the awesomeness of your Ceph cluster draws users and applications out of the woodwork, and the capacity you initially thought adequate might be severely taxed in the next fiscal year or even quarter. Clusters can be expanded by adding additional servers or swapping larger existing drives for smaller ones. The former can be a considerable ...

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