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

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The RAID reliability model is no longer promising

RAID can be configured with a variety of different types; the most common types are RAID5 and RAID6, which can survive the failure of one and two disks, respectively. RAID cannot ensure data reliability after a two-disk failure. This is one of the biggest drawbacks of RAID systems.

Moreover, at the time of a RAID rebuild operation, client requests are most likely to starve for I/O until the rebuild completes. Another limiting factor with RAID is that it only protects against disk failure; it cannot protect against a failure of the network, server hardware, OS, power, or other data center disasters.

After discussing RAID's drawbacks, we can come to the conclusion that we now need a system that ...

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