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

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Storage drive durability and speed

The durability of a given drive model is generally not a concern for traditional spinning drives, claims about enterprise versus consumer drives notwithstanding. Flash / SSD drives do, however, vary considerably. In the past, conventional wisdom held that Single-Level Cell (SLC) flash devices would last longer than denser/less-expensive Multi-Level Cell (MLC) models, though more recently this has been questioned. So long as you avoid the lowest-end consumer/desktop SATA drives, this distinction should not be a significant concern.

Modern enterprise-class drives incorporate greater over-provisioning, which means that a fraction of the storage cells are reserved so that the drive's on-board controller can ...

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