Hi, The general idea to preserve resilience but save space compared to replication. It costs more in terms of CPU and network. You will find a short introduction here : https://wiki.ceph.com/Planning/Blueprints/Dumpling/Erasure_encoding_as_a_storage_backend https://wiki.ceph.com/Planning/Blueprints/Firefly/Erasure_coded_storage_backend_%28step_3%29 For the next Ceph release Pyramid Codes will help reduce the bandwidth requirements https://wiki.ceph.com/Planning/Blueprints/Giant/Pyramid_Erasure_Code Cheers On 19/05/2014 13:52, yalla.gnan.kumar at accenture.com wrote: > Hi All, > > > > What exactly is erasure coding and why is it used in ceph ? I could not get enough explanatory information from the documentation. > > > > > > Thanks > > Kumar > > > ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ > > This message is for the designated recipient only and may contain privileged, proprietary, or otherwise confidential information. If you have received it in error, please notify the sender immediately and delete the original. Any other use of the e-mail by you is prohibited. Where allowed by local law, electronic communications with Accenture and its affiliates, including e-mail and instant messaging (including content), may be scanned by our systems for the purposes of information security and assessment of internal compliance with Accenture policy. > ______________________________________________________________________________________ > > www.accenture.com > > > _______________________________________________ > ceph-users mailing list > ceph-users at lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > -- Lo?c Dachary, Artisan Logiciel Libre -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 263 bytes Desc: OpenPGP digital signature URL: <http://lists.ceph.com/pipermail/ceph-users-ceph.com/attachments/20140519/b5140fa5/attachment.pgp>
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