6 nodes and RF3 will mean you can handle between 1 and 2 failed nodes. see http://thelastpickle.com/2011/06/13/Down-For-Me/ Cheers
----------------- Aaron Morton Freelance Cassandra Developer @aaronmorton http://www.thelastpickle.com On 7/10/2011, at 9:37 PM, Madalina Matei wrote: > Hi Aaron, > > For a 6 nodes cluster, what RF can we use in order to support 2 failed nodes? > From the article that you sent i understood "avoid EMS" and use ephemeral. am > i missing anything? > > Thank you so much for your help, > Madaina > On Fri, Oct 7, 2011 at 9:15 AM, aaron morton <aa...@thelastpickle.com> wrote: > Data Stax have pre build AMI's here > http://www.datastax.com/dev/blog/setting-up-a-cassandra-cluster-with-the-datastax-ami > > > And an explanation of why we normally avoid ephemeral. > > Also, I would go with 6 nodes. You will then be able to handle up to 2 failed > nodes. > > Hope that helps. > > ----------------- > Aaron Morton > Freelance Cassandra Developer > @aaronmorton > http://www.thelastpickle.com > > On 7/10/2011, at 9:11 PM, Yi Yang wrote: > >> Obviously ephemeral. It has higher IO availability, will not affect your >> Ethernet IO performance, and it is free (included in instance price) >> and the redundancy is provided by cassandra itself. >> 從我的 BlackBerry® 無線裝置 >> >> From: Madalina Matei <madalinaima...@gmail.com> >> Date: Fri, 7 Oct 2011 09:02:06 +0100 >> To: <user@cassandra.apache.org> >> ReplyTo: user@cassandra.apache.org >> Subject: ebs or ephemeral >> >> Hi, >> >> I'm looking to deploy a 5 nodes cluster in EC2 with RF3 and QUORUM CL. >> >> Could you please advice me on EBS vs ephemeral storage ? >> >> Cheers, >> Madalina > >
