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

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Writeback mode

When Ceph cache tiering is configured as a writeback mode, a Ceph client writes the data to the cache tier pool, that is, to the faster pool, and hence receives acknowledgment instantly. Based on the flushing/evicting policy that you have set for your cache tier, data is migrated from the cache tier to the storage tier, and eventually removed from the cache tier by a cache-tiering agent. During a read operation by the client, data is first transferred from the storage tier to the cache tier by the cache-tiering agent, and it is then served to clients. The data remains in the cache tier until it becomes inactive or cold. The cache tier with the writeback mode is ideal for mutable data such as photo or video editing, transactional ...

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