Hi Ceph, Yesterday I implemented a simple erasure code plugin that can sustain the loss of a single chunk.
https://github.com/dachary/ceph/blob/wip-5878/src/osd/ErasureCodeExample.h and it works as shown in the unit test https://github.com/dachary/ceph/blob/wip-5878/src/test/osd/TestErasureCodeExample.cc It would be of limited use in a production environment because it only saves 25% space ( M=2 K=1 ) over a 2 replica pool, but it would work. I would very much appreciate a review of the erasure code plugin system and the associated example plugin : https://github.com/ceph/ceph/pull/515 When it's good enough, creating a jerasure plugin will be next :-) Cheers -- Loïc Dachary, Artisan Logiciel Libre All that is necessary for the triumph of evil is that good people do nothing.
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