Hi John, Thanks for the reply. It seems that to understand the internal mechanism and the algorithmic structure of ceph, knowledge of Information theory is necessary ?. Thanks Kumar From: John Wilkins [mailto:john.wilkins@xxxxxxxxxxx] Sent: Monday, May 19, 2014 10:18 PM To: Gnan Kumar, Yalla Cc: Loic Dachary; ceph-users at lists.ceph.com Subject: Re: Erasure coding I have also added a big part of Loic's discussion of the architecture into the Ceph architecture document here: http://ceph.com/docs/master/architecture/#erasure-coding On Mon, May 19, 2014 at 5:35 AM, <yalla.gnan.kumar at accenture.com<mailto:yalla.gnan.kumar at accenture.com>> wrote: Hi Loic, Thanks for the reply. Thanks Kumar -----Original Message----- From: Loic Dachary [mailto:loic@xxxxxxxxxxx<mailto:loic at dachary.org>] Sent: Monday, May 19, 2014 6:04 PM To: Gnan Kumar, Yalla; ceph-users at lists.ceph.com<mailto:ceph-users at lists.ceph.com> Subject: Re: Erasure coding 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<mailto: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<http://www.accenture.com> > > > _______________________________________________ > ceph-users mailing list > ceph-users at lists.ceph.com<mailto:ceph-users at lists.ceph.com> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > -- Lo?c Dachary, Artisan Logiciel Libre _______________________________________________ ceph-users mailing list ceph-users at lists.ceph.com<mailto:ceph-users at lists.ceph.com> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -- John Wilkins Senior Technical Writer Intank john.wilkins at inktank.com<mailto:john.wilkins at inktank.com> (415) 425-9599 http://inktank.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.ceph.com/pipermail/ceph-users-ceph.com/attachments/20140520/6d1aafef/attachment.htm>
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