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Ceph: Designing and Implementing Scalable Storage Systems
book

Ceph: Designing and Implementing Scalable Storage Systems

by Michael Hackett, Vikhyat Umrao, Karan Singh, Nick Fisk
January 2019
Intermediate to advanced content levelIntermediate to advanced
606 pages
15h 1m
English
Packt Publishing
Content preview from Ceph: Designing and Implementing Scalable Storage Systems

Flushing and eviction

The main tuning options should be looked at first are the ones that define the size limit to the top tier, when it should flush and when it should evict.

The following two configuration options configure the maximum size of the data to be stored in the top tier pool:

    target_max_bytes    target_max_objects 

The size is either specified in bytes or number objects and does not have to be the same size as the actual pool, but it cannot be larger. The size is also based on the available capacity after replication of the RADOS pool, so for a 3x replica pool, this will be a one-third of your raw capacity. If the number of bytes or objects in this pool goes above this limit, I/O will block; therefore, it's important that thought ...

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Publisher Resources

ISBN: 9781788295413