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Feature #25166

Updated by Lenz Grimmer over 1 year ago

Ceph provides a concept of "cache pools":http://ceph.com/docs/master/dev/cache-pool/. It should be possible for an administrator to define such a cache pool and assign it to an existing pool via dashboard:

h3. h2. Purpose

Use a pool of fast storage devices (probably SSDs) and use it as a cache for an existing slower and larger pool.

Use a replicated pool as a front-end to service most I/O, and destage cold data to a separate erasure coded pool that does not currently (and cannot efficiently) handle the workload.

We should be able to create and add a cache pool to an existing pool of data, and later remove it, without disrupting service or migrating data around.

h3. h2. See also:

http://lists.ceph.com/pipermail/ceph-users-ceph.com/2016-October/013880.html
http://docs.ceph.com/docs/master/rados/operations/cache-tiering/
https://www.packtpub.com/packtlib/book/Application-Development/9781784393502/8/ch08lvl1sec91/Creating%20a%20pool%20for%20cache%20tiering

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