I've added a blueprint for avoiding double-writes when using btrfs:
http://wiki.ceph.com/01Planning/02Blueprints/Emperor/osd:_clone_from_journal_on_btrfs
This should improve throughput significantly when the journal is a file in
btrfs.
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Also, there's one for improving the localized read behavior:
http://wiki.ceph.com/01Planning/02Blueprints/Emperor/librados%2F%2Fobjecter%3A_smarter_localized_reads
For example, for read-only parents of rbd clones, we may as well read from
the replica in the same host or rack or row--whatever crush can tell
us--and not the primary. This is good for locality and load distribution
when certain object sets are hot.
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