You have probably already be faced to migrate all objects from a pool to another, especially to change parameters that can not be modified on pool. For example, to migrate from a replicated pool to an EC pool, change EC profile, or to reduce the number of PGs... There are …

This is a simple example of federated gateways config to make an asynchonous replication between two Ceph clusters.

(Update Nov. 2016 : Since Jewel version, radosgw-agent is no more needed and active-active replication between zone is now supported. See here : http://docs.ceph.com/docs/jewel/radosgw/multisite/)

( The configuration below …

Get the PG distribution per osd in command line :

pool :  0   1   2   3   | SUM 
------------------------------------------------
osd.10  6   6   6   84  | 102
osd.11  7   6   6   76  | 95
osd.12  4   4   3   56  | 67
osd.20  5   5   5   107 | 122
osd.13  3   3   3   73  | 82 …

It is not always easy to know how to organize your data in the Crushmap, especially when trying to distribute the data geographically while separating different types of discs, eg SATA, SAS and SSD. Let's see what we can imagine as Crushmap hierarchy.

Take a simple example of a distribution …

Ceph makes it easy to create multiple cluster on the same hardware with the naming of clusters. If you want a better insolation you can use LXC, for example to allow a different version of Ceph between your clusters.

For this you will need access to the physical disks from …