Is your data already compressed? If it's not you can safely assume a compression ratio of 5.
Olivier On 9 Jul 2014 17:10, "Mirko Kämpf" <mirko.kae...@gmail.com> wrote: > Hello, > > if I follow your numbers I see one missing fact: *What is the number of > HDDs per DataNode*? > Let's assume you use machines with 6 x 3TB HDDs per box, you would need > about 60 DataNodes > per year (0.75 TB per day x 3 for replication x 1.3 for overhead / ( nr of > HDDs per node x capacity per HDD )). > With 12 HDD you would only need 30 servers per year. > How did you calculate the number of 367 datanodes? > > Cheers, > Mirko > > > 2014-07-09 17:59 GMT+02:00 YIMEN YIMGA Gael <gael.yimen-yi...@sgcib.com>: > >> Hello Dear, >> >> >> >> I made an estimation of a number of nodes of a cluster that can be >> supplied by 720GB of data/day. >> >> My estimation gave me *367 datanodes* in a year. I’m a bit afraid by >> that amount of datanodes. >> >> The assumptions, I used are the followings : >> >> >> >> - Daily supply (feed) : 720GB >> >> - HDFS replication factor: 3 >> >> - Booked space for each disk outside HDFS: 30% >> >> - Size of a disk: 3TB. >> >> >> >> I have two questions. >> >> >> >> First, I would like to know if my assumptions are well taken? >> >> Secondly, could someone help me to evaluate that cluster, to let me be >> sure that my results are not to excessive, please ? >> >> >> >> Standing by for your feedback >> >> >> >> Warm regard >> >> ************************************************************************* >> This message and any attachments (the "message") are confidential, >> intended solely for the addressee(s), and may contain legally privileged >> information. >> Any unauthorised use or dissemination is prohibited. E-mails are >> susceptible to alteration. >> Neither SOCIETE GENERALE nor any of its subsidiaries or affiliates shall >> be liable for the message if altered, changed or >> falsified. >> Please visit http://swapdisclosure.sgcib.com for important information >> with respect to derivative products. >> ************ >> Ce message et toutes les pieces jointes (ci-apres le "message") sont >> confidentiels et susceptibles de contenir des informations couvertes >> par le secret professionnel. >> Ce message est etabli a l'intention exclusive de ses destinataires. Toute >> utilisation ou diffusion non autorisee est interdite. >> Tout message electronique est susceptible d'alteration. >> La SOCIETE GENERALE et ses filiales declinent toute responsabilite au >> titre de ce message s'il a ete altere, deforme ou falsifie. >> Veuillez consulter le site http://swapdisclosure.sgcib.com afin de >> recueillir d'importantes informations sur les produits derives. >> ************************************************************************* >> > > -- CONFIDENTIALITY NOTICE NOTICE: This message is intended for the use of the individual or entity to which it is addressed and may contain information that is confidential, privileged and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient, you are hereby notified that any printing, copying, dissemination, distribution, disclosure or forwarding of this communication is strictly prohibited. If you have received this communication in error, please contact the sender immediately and delete it from your system. Thank You.
