Hi Loic, If you still need to calculate more coefficients there is an explanation of how to construct the coding equations in the paper Erasure coding in Windows Azure Storage (unless you will keep your LRC implementation simple and do only the LRC (10,6,5) ). I undertand that the codes LRC in the mentioned paper are not exactly the same but at least the paper explains the coefficients. I think in Azure they used functional repair instead of exact repair as you wish. koleosfuscus ________________________________________________________________ "My reply is: the software has no known bugs, therefore it has not been updated." Wietse Venema -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html