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Rbd journal » History » Version 1

Josh Durgin, 07/01/2015 12:05 AM

1 1 Josh Durgin 
h1. RBD journalling
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*Summary*





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This is the next step towards disaster recovery for rbd. The idea is to record all writes (data and metadata changes) to a journal of rados objects, preserving a consistent point-in-time stream that can be mirrored to other sites.





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*Owners*





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Jason Dillaman (Red Hat)





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*Interested Parties*





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Josh Durgin (Red Hat)





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*Current Status*





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A new feature bit is added for enabling journalling for an image, and a general journaling mechanism is almost ready.





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*Detailed Description*





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See http://comments.gmane.org/gmane.comp.file-systems.ceph.devel/25331





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Updates since then: active sets of objects are switched out wholesale once any current object becomes full, so that replay is bounded to an active set of objects as a maximum necessary amount of data to read at once.