On Mon, 25 Mar 2013, Sage Weil wrote:
> There is one minor change (fix) in the output to the 'ceph osd tree 
> --format=json' command. Please see the full release notes.

Greg just reminded me about one additional note about upgrades (that 
should hopefully affect noone):

* The MDS disk format has changed from prior releases *and* from v0.57. In 
  particular, upgrades to v0.56.4 are safe, but you cannot move from 
  v0.56.4 to v0.57 if you are using the MDS for CephFS; you must upgrade
  directly to v0.58 (or later) instead.

sage
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