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

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Storage drive form factor

While it is possible to mix use cases, server strategies, and storage technologies within a single cluster, for clarity here we'll focus on uniform deployments.

The most common physical sizes of storage drives in use today are 3.5" LFF and 2.5" Small. You may also occasionally find the 1.8" form factor that never caught on in a big way. Recent and emerging technologies include PCI-e and hot-pluggable U.2 NVMe solid-state devices.

Major server vendors usually offer both LFF and SFF chassis models. LFF models and rotating drives often offer greater TB/RU (Rack Unit) and TB/unit cost. SFF models and rotating drives typically provide more but smaller drives, and the greater number of spindles presents increased parallelism ...

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